Xcode "Size to fit contents" disabled

Question

I am following the Stanford lectures on developing apps for iOS and I've run into a bit of a problem. The lecturer says to click on a label from the Document Outline and then go to Editor > Size to fit contents in order to remove the fixed size constraints. However my problem is that "Size to fit contents" is disabled and I cannot click it (see image).

Any idea what I'm doing wrong?

Answer 1

I fixed the issue by dragging around the labels and resizing them (randomly) manually and then the option was enabled!