Recently a "save" button was added, the checkmark on the right upper corner in the editing view:
This is feedback on a little inconsistency in its behavior: Normally it saves the entry and shows the immutable view of the entry just edited. This is nice and expected. However, if you opened the edit view by pressing the floating edit button in the home view, it actually takes you back to home, same as if you had just pressed the back button. It should probably show the immutable card in this case too, same as in others.