Why will the figure not fold?
I am trying to fold this figure at the line where the two sketches meet, but when I click the line, it will not fold? What should I try doing instead?
depends on whether you are trying to bend Or fold the part.
if you are trying to FOLD the you must use sheet metal option with the thickness placed the option ie:- in this case 0,5 mm even if this is the default thickness uncheck the thickness box.
If you are trying to BEND the part then use bend part option in your 3D option.