Dashed lines don't disappear

Hi!! I’m new at Sketchup and I’m using the Sketchup Free Web version. So it happens that some dashed lines appeared in my drawing and I don’t know how to fix it, how can I take them off?

Sorry for my english if there is some mistake!! I’m learning it too :sweat_smile:

They are back edges and the default keyboard toggle for them is k. You probably hit k at some stage without realising. Hit it again and they will go away.
As this is not a tutorial I’m moving it to the web category.