Hey there!
I was trying to make the Twitter logo with the new Shape Builder tool to kinda "learn" this tool. As a long-time Affinity user I'm not all that familiar with it of course.
I quickly found that that in my opinion it's the easiest to work with it while using the Wireframe mode. However, it makes the image a square outline of (obviously).
I'd like to make a suggestion where you can disable Wireframe affecting images. This way, it would be way easier to use Wireframe in such instances.