Dashed Lines - how to hide?

Hello I am working on a Sketch Up model and these white dashed lines are appearing along some of the edges - any ideas how I can hide them?
Screen Shot 2021-02-21 at 13.11.31|405x500

Looks like the inside faces bleeding through. If so, that’s an OpenGL artifact. Considering they are so light, first make sure that you have correct face orientation and the front faces are out. Back faces should be toward the inside. Then in the Styles panel, edit the back face color to make it dark. Update the style.

What style are you using. Is that one you made or one that shipped with the program?