Using a supported version?
Overall summary
With the window maximized, there's still a substantial gap between the window border and the edge of the screen.
I'm guessing this is related to the window having a shadow, because it looks like the gap is where the shadow is being rendered.
Steps to reproduce
Open Signal Desktop. Maximize it.
Expected result
No gap between window border and edge of screen.
Actual result
Gap between window border and edge of screen. See screenshot.
Screenshots
Signal version
7.82.0-beta.1
Operating system
Linux (latest Debian sid), GNOME
Version of Signal on your phone
No response
Link to debug log
No response