Is collapse (as in Layout blocks) working in the form view?

I came across this frustration a while ago…and it seems to be unresolved. Or is it just me? But the collapse does not work in form view, only in grid view. The little arrow top left is there, but nothing happens when I click it. I can start with the block collapsed, or start with it open, but either way I cannot click to change its status. Please could someone confirm that this is the case? I have tried all sorts of combinations in the settings but nothing has worked so far.

Anyone care to test this? I am referring to the Layout section. Blocks. We should be able to collapse the block by pressing the little arrow on the left. But for me it is just not working. I am in form view.

Works for me.

I wonder what I am doing wrong? I have tested it in a test form and it does work. But the form I have does not. In testing I left the defaults as is, and it worked. I am trying to work out what is different in this form. Something is messing up the JavaScript I believe. I have a warning and an error in the console . I am investigating.this error …jquery.js:2 Uncaught SyntaxError: Unexpected identifier.