Hello!
When starting LFS Editor, an error occurs - No modes found.
How to fix it?

Is there any information in your deb.log file?

The LFS Editor uses D3D11 so it's possible that LFS works but LFS editor does not, if you have an old computer that does not support D3D11.

Windows Vista comes without D3D11 but it can be installed with SP2.
https://learn.microsoft.com/en-us/windows/win32/direct3d11/atoc-dx-graphics-direct3d-11

I have the same error, this is my deb.log file info:
Aug 05 13:37:04 LFS : 0.7C
Aug 05 13:37:04 timer resolution 1 ms
Aug 05 13:37:04 read config
Aug 05 13:37:04 get command line
Aug 05 13:37:04 preinit d3d
Aug 05 13:37:04 No modes found

i tried a lot of things but nothing works (LFS editor works while i had windows 8.1. Now i have windows 10, i dont know if that could be the problem.

Is there a line "Adapter Select" or "Output Select" in your cfg.txt?

Some more info here. I'm wondering if there could be something left over from your previous install. Or maybe you have reinstalled a new editor, so then there isn't much in your cfg.txt anyway.
https://www.lfs.net/forum/post/2051977#post2051977

I do think I need to include some extra error logging for startup issues, and have a note about that.