How to make the preliminary line appear when dimensioning a drawing

I am making drawings in Soliworks, and I had a problem with a drawing. When I wanted to dimension a line, I can't point the line as usual, and I can't dimension it. Always, before dimensioning a line, a “previous orange line” appeared to indicate the line I want to dimension, but now this previous line does not appear.
I attach some images to help you understand what I am talking about.