I've a problem with Sketchup Free

[samuel2]

Hi, I’m a student in Spain, and I’m doing a work in school about a house.
I don’t know what I did or what I clicked, but the problem I’ve is that I don’t know how to erase the lines of the measurements and contour of the walls.
Here you can see it:

If someone knows what to do, please forward me, I’m very stressed with these, and I have no time left.
Thanks.

[Box]

Tap k

[anon91144253]

Whoa. I didn’t know that was even a thing.

[john_mcclenahan]

k is the shortcut to toggle back edges on or off (show edges hidden behind your model’s front faces).

You can also select it from the View menu.