It's the client side decoration (CSD) implemented in gtk3 and gtk4. There is an addon for applications using gtk3 (https://github.com/PCMan/gtk3-nocsd). But there's no such solution for applications using gtk4.
If you would like to refer to this comment somewhere else in this project, copy and paste the following link:
hello,
some application (firefox,telegram) have no more border, so i can not resize them.
how can i fix them?
regards
It's the client side decoration (CSD) implemented in gtk3 and gtk4. There is an addon for applications using gtk3 (https://github.com/PCMan/gtk3-nocsd). But there's no such solution for applications using gtk4.
@Bernd thank you for the info.
I find a solution but not easy with the GUI but CLI using a tool to manipulate windows : xdotool
with command like this one:
xdotool windowmove 176160829 100 50
xdotool search --onlyvisible --name firefox
etc...