I just purchased a new iMac and updated LightBurn from 1.3 to 1.6. When opened to the working grid window, the bottom of the window is cut off. I usually can use the cursor to make the window fit my screen. Now all I can do is make the window narrower in width, cannot make the window less tall or use the cursor at a corner and diagonally move the cursor to move both width and height at the same time. I am sure it is something very simple, but I am just not figuring this out.
I should have mentioned that I have an external monitor also. I watched the videos you included and played around with it for awhile. Somehow I got it to fit the way I am used to. Before, the colored layers which I have on the bottom left of my screen were not showing along with the X-axis numbers below the graphed work space. I can now go to a corner of the window and used the diagonal cursor to size it both ways at once. I really do not know how I got it to this point, but I must have learned something from the video links you provided.