Is there a Universal Heal Command?

I’m pretty new to SketchUp. I’ve been trying to import my house designs into SketchUp, but I have trouble seeing what I am doing. I have tried both hiding and erasing the faces of the 2D model so I can see what I’m doing. Afterwards I have to open and close every closed figure to try to heal them. Half of them just won’t heal no matter what I do. Is there a way to just heal everything without all the tedious labor?
I try to select everything, but then when I try for the right-click dropdown menu, everything immediately unselects. I’m just an Architectural amateur; I hope I can do this with the Shop version.