I don’t think it is my graphic card. It is up to date. I have a very similar drawing for the first floor of this house, and I am having no issues with that one.
That has caused graphical issues for other users in older versions of SketchUp and particularly in LayOut. I haven’t seen it in SketchUp or LayOut 2026, though.
Keeping things condensed and close to the origin might help. Maybe you don’t need to start over. Just use the Move tool to move all your 2D drawings closer to the center.
It’s really puzzling to me that you are using a 3D modeling program to do all these 2D drawings. Since you’re planning to go to LayOut why don’t you just start in LayOut?