diff --git a/src/components/navbars/appNavBar.tsx b/src/components/navbars/appNavBar.tsx
index ecdd9f7..6c37725 100644
--- a/src/components/navbars/appNavBar.tsx
+++ b/src/components/navbars/appNavBar.tsx
@@ -23,14 +23,14 @@ import {
   useTheme
 } from '@mui/material';
 
-const currTheme = createTheme({
-    palette: {
-        primary: {
-            main: '#ffffff',
-            contrastText: '#000000'
-        },
-    },
-});
+// const currTheme = createTheme({
+//     palette: {
+//         primary: {
+//             main: '#ffffff',
+//             contrastText: '#000000'
+//         },
+//     },
+// });
 
 export default function AppNavBar(props) {
     const [isDrawerOpen, setDrawerOpen] = React.useState(false);
@@ -41,6 +41,81 @@ export default function AppNavBar(props) {
     const apiDisplayName = API_Name(apiStatus.currentApi);
     const accentColor = displayStatus.secondaryColor;
 
+    const TOP_TRIGGER_ZONE = 48; // px from top to reveal
+    const HIDE_TIMEOUT_MS = 2500;
+    const [topbarLocked, setTopbarLocked] = React.useState<boolean>(false);
+    const [topbarVisible, setTopbarVisible] = React.useState<boolean>(true);
+    const hideRef = React.useRef<number | null>(null);
+    const pointerStartY = React.useRef<number | null>(null);
+    const pointerId = React.useRef<number | null>(null);
+
+    const showTopbar = React.useCallback(() => {
+        setTopbarVisible(true);
+        if (hideRef.current) {window.clearTimeout(hideRef.current); hideRef.current = null;}
+        if (!topbarLocked) {
+            hideRef.current = window.setTimeout(() => setTopbarVisible(false), HIDE_TIMEOUT_MS);
+        }
+    }, [topbarLocked]);
+
+    React.useEffect(() => {showTopbar();}, [showTopbar]); //to activate immediately
+
+    React.useEffect(() => {
+        const onPointerDown = (e: PointerEvent) => {
+            if(pointerId.current !== null) return;
+
+            const y = e.clientY;
+            pointerId.current = e.pointerId;
+            pointerStartY.current = y;
+
+            if (y <= TOP_TRIGGER_ZONE) {
+                showTopbar();
+            }
+        };
+
+        const onPointerMove = (e: PointerEvent) => {
+            // proximity check
+            if (e.clientY <= TOP_TRIGGER_ZONE) {
+                showTopbar();
+            }
+            // swipe down check
+            if (e.pointerId !== pointerId.current || pointerStartY.current === null) {
+                return;
+            }
+            const y = e.clientY
+            const delta = y - (pointerStartY.current ?? 0);
+            const SWIPE_THRESHOLD = 40; //how far to swipe
+
+            if(pointerStartY.current <= TOP_TRIGGER_ZONE && delta >= SWIPE_THRESHOLD) {
+                showTopbar();
+
+                // reset
+                pointerStartY.current = null;
+                pointerId.current = null;
+            }
+        };
+
+        const onPointerUp = (e: PointerEvent) => {
+            if(e.pointerId === pointerId.current) {
+                pointerId.current = null;
+                pointerStartY.current = null;
+            }
+        };
+
+        window.addEventListener('pointerdown', onPointerDown, {passive: true });
+        window.addEventListener('pointermove', onPointerMove, {passive: true });
+        window.addEventListener('pointerup', onPointerUp);
+        window.addEventListener('pointercancel', onPointerUp);
+
+        return () => {
+            window.removeEventListener('pointerdown', onPointerDown);
+            window.removeEventListener('pointermove', onPointerMove);
+            window.removeEventListener('pointerup', onPointerUp);
+            window.removeEventListener('pointercancel', onPointerUp);
+        };
+    }, [showTopbar]);
+
+    React.useEffect(() => () => {if (hideRef.current) window.clearTimeout(hideRef.current); }, []);
+
     const theme = useTheme();
     // const isMobile = useMediaQuery(theme.breakpoints.down('sm'));
 
@@ -54,7 +129,7 @@ export default function AppNavBar(props) {
 
     return (
         <ThemeProvider theme={theme}>
-            <AppBar position="fixed" id="topbar-wrapper" sx={{ transition: '0.6s', backgroundColor: accentColor }}>
+            <AppBar position="fixed" id="topbar-wrapper" sx={{ transition: 'transform 240ms ease-in-out', transform: topbarVisible ? 'translateY(0)' : 'translateY(-100%)', backgroundColor: accentColor }}>
                 <Toolbar sx={{ width: '100%', minHeight: 56, color: 'white' }}>
                     <Grid container alignItems="center" justifyContent="space-between">
                         <Grid container alignItems="center" justifyContent="space-between" sx={{ width: '100%' }}>
@@ -89,6 +164,15 @@ export default function AppNavBar(props) {
                                     apiDisplayName={apiDisplayName}
                                     listening={controlStatus.listening}
                                     menuVisible={displayStatus.menuVisible}
+
+                                    topbarLocked={topbarLocked}
+                                    onTopBarToggle= {(v) => {
+                                        setTopbarLocked(v);
+                                        if(v) {
+                                            setTopbarVisible(true);
+                                            if (hideRef.current) {window.clearTimeout(hideRef.current); hideRef.current=null; }
+                                        }
+                                    }}
                                 />
                             </Grid>
                         </Grid>
diff --git a/src/components/navbars/topbar/apiDropdown.tsx b/src/components/navbars/topbar/apiDropdown.tsx
index 8d76c2b..e36b9c4 100644
--- a/src/components/navbars/topbar/apiDropdown.tsx
+++ b/src/components/navbars/topbar/apiDropdown.tsx
@@ -107,11 +107,11 @@ export default function ApiDropdown(props) {
         {isWhisperActive ? <WhisperIcon /> : null}
         <span>{props.apiDisplayName}</span>
         <Tooltip title="API choice">
-          <IconButton onClick={handleClick}>
-            <ThemeProvider theme={currTheme}>
-              {open ? <ExpandLess color="primary" fontSize="large" /> : <ExpandMore color="primary" fontSize="large" />}
-            </ThemeProvider>
-          </IconButton>
+          <ThemeProvider theme={currTheme}>
+            <IconButton color='primary' onClick={handleClick}>
+              {open ? <ExpandLess fontSize="large" /> : <ExpandMore fontSize="large" />}
+            </IconButton>
+          </ThemeProvider>
         </Tooltip>
       </Box>
       <Menu
diff --git a/src/components/navbars/topbar/listening.tsx b/src/components/navbars/topbar/listening.tsx
index 4d7b88d..15b7cbf 100644
--- a/src/components/navbars/topbar/listening.tsx
+++ b/src/components/navbars/topbar/listening.tsx
@@ -29,8 +29,8 @@ import * as React from 'react';
                         {props.listening === false ? "Begin Listening" : "Pause Listening"}>
                         <IconButton color="primary" onClick={handleClick}>
                             {props.listening ? 
-                                <MicIcon color="primary" fontSize="large"/> : 
-                                <MicOffIcon color="primary" fontSize="large"/>
+                                <MicIcon fontSize="large"/> : 
+                                <MicOffIcon fontSize="large"/>
                             }
                         </IconButton>
                     </Tooltip>
diff --git a/src/components/navbars/topbar/lock.tsx b/src/components/navbars/topbar/lock.tsx
new file mode 100644
index 0000000..d99391f
--- /dev/null
+++ b/src/components/navbars/topbar/lock.tsx
@@ -0,0 +1,37 @@
+import { LockIcon, LockOpenIcon, ThemeProvider, IconButton, Tooltip } from "../../../muiImports"
+import * as React from 'react';
+import Theme from '../../theme'
+
+interface Props {
+    locked?: boolean;
+    onToggle?: (locked: boolean) => void;
+}
+
+export default function LockToggle(props: Props) {
+    const {locked: lockedProp, onToggle} = props;
+    const [locked, setLocked] = React.useState<boolean>(!!lockedProp);
+
+    React.useEffect(()=>{
+        if(typeof lockedProp === 'boolean') setLocked(lockedProp);
+    }, [lockedProp]);
+
+    const handleClick = () => {
+        const next = !locked;
+        setLocked(next);
+        onToggle?.(next);
+    };
+     const {myTheme} = Theme()
+     // color "primary" comes from Theme()
+     return (
+       <div>
+        <ThemeProvider theme={myTheme}>
+          <Tooltip title = {locked ? "Unlock (hide)" : "Lock (keep visible)"}>
+            <IconButton color="primary" onClick={handleClick}>
+              {locked ? <LockIcon /> : <LockOpenIcon />}
+            </IconButton>
+          </Tooltip>
+         </ThemeProvider>
+
+       </div>
+     );
+}
\ No newline at end of file
diff --git a/src/components/navbars/topbar/topBar.tsx b/src/components/navbars/topbar/topBar.tsx
index de3a20f..386cc19 100644
--- a/src/components/navbars/topbar/topBar.tsx
+++ b/src/components/navbars/topbar/topBar.tsx
@@ -1,11 +1,12 @@
 import * as React from 'react';
-import { Grid, Box } from '../../../muiImports';
+import { /*Grid,*/ Box } from '../../../muiImports';
 
 import ApiDropdown from './apiDropdown';
 import Fullscreen from './fullScreen';
 import Listening from './listening';
 import QRCodeScreen from './qrCodeScreen';
-import MenuHider from './menuHider';
+import LockToggle from './lock';
+// import MenuHider from './menuHider';
 import TranscriptDownload from './transcriptDownload';
 
 import {
@@ -20,6 +21,8 @@ import {
 
     const iconSize = isMobile ? "small" : "medium";
 
+    const {topbarLocked, onTopBarToggle } = props;
+
     return (
         <Box sx={{
             display: 'flex',
@@ -37,6 +40,7 @@ import {
             {/* Only display if there is enough space */}
             {<Listening listening={props.listening} iconSize={iconSize} />}
             {/* {!isMobile && <MenuHider menuVisible={props.menuVisible} iconSize={iconSize} />} */}
+            {<LockToggle locked = {topbarLocked} onToggle={onTopBarToggle}/>}
             {<TranscriptDownload />}
             { <Fullscreen iconSize={iconSize} />}
             {!isMobile && <QRCodeScreen />}