It happens to several GNU/Linux users that LightBurn does NOT keep the layout as we configured it, many times it changes to the default layout.
Although according to research in the forum, this happens when our screen is smaller than what the layout needs, so it resets it. Even if we have a giant screen.
As much as I tried things like @TomWS did at here
or @Karl.S at here
None worked for me. 
Trying to understand why it happened, I realized that LightBurn āsometimesā saves an incorrect value of the window sizes. As also discovered by @doegox at here and it also generates the same negative numbers always, and these are stored in the prefs.ini file
"WindowSizeX": -1,
"WindowSizeY": -38,
I also discovered that if I changed its size before closing the window, the correct value was saved thereā¦ but many times I forgot.
So I made this patch which in short changes the values in the prefs.ini file to real values and runs LightBurn without problems.
If you have the same problem this should help you.
Any suggestions would be welcomeā¦
Now I am a happy person 
PS Sorry for my english, Iām using google translate