I noticed this feature with desktop version of Manager, and haven’t seen any other posts talking about it.
When editing any item (anything with an edit button), the id is show on top left, in the grey-ish name bar of the thing being edited. Its quite hard to notice due to blending in with the background, but it’s there.
Alternatively, going to http://127.0.0.1:55667 in your browser with a dark mode plugin makes it easier to see.
Edit: This works only with the Manager application running.
Now there’s no need to use the convoluted batch update method