Tibet, I'm not sure if it was my brain or my comupter yesterday but today upon trying all is as expected. Ok to close the ticket.

I’m trying to edit the sidebar.

When I click Edit Menu at the bottom of the sidebar it opens the spaces editor. This onky happens on my Mac. Not on my phone.

Can you explain a bit more April? Clicking Edit Menu will open up More Spaces on the right hand side so you can choose to move spaces to or from the menu. The menu editing happens in the menu itself on the left. To edit a space you can mouse over the menu item of the space, click the three dot menu and click Settings. Or do you mean you want to Edit the space's menu? To do that click the pencil icon that says Edit Space Menu when you hover over it. Or you can click Edit Menu while you are inside the space.

It works fine on my iPhone. Kudos on the mobile fixes!