To change a scene name you click on the wrench icon and then edit the name field. For all other scene edits (as far as I can tell) the submit button turns red (pointing out that you need to submit the changes). But not with the name field. Really small item like I said. Clicking the still white submit button ‘does’ work to save the change.
Edit: I always forget. AltUI v0.94.849 Using Chrome browser.