In Writer, on the status bar, there is no indication of insert mode. also, the Insert key does not work, although it is assigned to Insert Mode. In other apps (e.g. Sublime Text) the Insert key works as expected. Is there something that I can do to switch from insert to overwrite mode and back?
from Switching Between Insert Mode and Overwrite Mode :
On the Status Bar, click on the area indicating the current mode in order to switch to the other mode:
- Insert
The area in the status bar is blank, when Insert mode is active. The text cursor is a blinking vertical line. Click on the area to activate the overwrite mode.
try in Safe Mode , you should get : 
and of course : more-details-3
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