Having trouble getting dimension arrow inside of figure instead of outside.

[taylorv2015]

I'm going for this:

But I cannot figure out how to force the 20 arrow to the inside of my figure to match the bottom photo.

[Patchy]

Grab the text and move it.

and change this setting:

[Kent1Cooper]

To make it less often kick the arrows outside like that in the first place, try the approach >here<.