Without seeing your model or at least a screenshot, we can only guess what your issue is.
My guess would be that you are working too small.
Have a look here.
https://forums.sketchup.com/t/the-dave-method/49720/2
Without seeing your model or at least a screenshot, we can only guess what your issue is.
My guess would be that you are working too small.
Have a look here.
https://forums.sketchup.com/t/the-dave-method/49720/2