Only been using Ubuntu for a couple weeks.
The amount of wasted space along the top of some windows is almost comical, but I realize that is largely due to the developers. For example, Chrome and Microsoft Teams make great use of the space. Firefox and Visual Studio Code... oof.
Trying to resolve this, I came across an answer on here suggesting gnome-shell-extension-pixelsaver. Worked great for several days. Then just quit working yesterday. I've tried to sudo apt purge gnome-shell-extension-pixelsaver and then reinstall. Restart, etc. Doesn't fix it.
I also tried no-title-bar and also made sure x11-utils was installed. Doesn't do anything either.
I haven't made any changes to the system, so I'm perplexed why it would just quit working.
Any suggestions on how to resolve this?
EDIT - 3/27/20
I ended up doing a reformat for a couple reasons, this being one of them.
Used this extension on the clean reformat:
https://github.com/pixel-saver/pixel-saver
Again... works for a few days and then stops working. Reinstalling it does nothing.
get dconf editor and go to org->gnome->terminal->legacy->headerbar set to false. Then you can use the extension unite to e.g. remove titlebars when tiled of when the terminal fills the whole screen.
But but but I experience some glitches with the shadows behind the terminal when doing this. Maybe you wont. For now there is no other fixes.