Remove completion box in applications

[PresidentPlant]

For some applications, especially terminal emulators such as st, alacritty, urxvt, when you input Korean using fcitx-hangul, it doesn't directly input it, but a pop-up box shows up where you have to finish typing your character.

Typing in the firefox search bar:

No 'box' and the last character (트) can be edited directly

Typing in urxvt:

A box appears and it stays until I move on to the next character, in which case another box appears.

fcitx-diagnose.txt