I am using CudaText [0] with the Distraction Free mode [1] to have a full screen editor "always on" the weekend when I write (on Windows 11, but it should work on Linux).

There is also a full screen mode plugin on GVim [2] but I haven't tested it.

[0] https://cudatext.github.io/ [1] https://wiki.freepascal.org/CudaText#Full-screen_mode [2] https://github.com/lambdalisue/vim-fullscreen