'Add all open tabs to collection' option is gone; when you right click on a tab it used to be at the bottom? Help?

Sorry, it is not wrong, what has happened is that the change is forced to personal microsoft accounts. When you log out of your account on Edge, you will have the "old style" collections experience, just as if you logged into a work or school account.

Again, you need to be logged in to a personal account to see the new experience. If any other condition is true, you won't.

Incidentally the add all option is not the only thing that changed. Poke around and you will find other options that are missing or actually are bugs that don't work.

Yes it is wrong. It is a confirmed bug. Collections logged in and logged out should still have such functions (add to collections)in the same manner. Microsoft Engineering Teams have already confirmed this to be a bug months ago

Well, I see different versions of Collections based on which account I'm logged in: work, personal, and signed out. I'm on version 114.0.1823.82 (64-bit). Screenshots attached.

Sorry, it is not wrong, what has happened is that the change is forced to personal microsoft accounts. When you log out of your account on Edge, you will have the "old style" collections experience, just as if you logged into a work or school account.

Again, you need to be logged in to a personal account to see the new experience. If any other condition is true, you won't.

Incidentally the add all option is not the only thing that changed. Poke around and you will find other options that are missing or actually are bugs that don't work.

Wrong, collections was auto-upgraded for all users to the new version. There is only one version of it. It does not revert to a different or previous version when you log out, it just gives you the add to collections option back for open tabs.

It's only a bug if it's not by design. Just as I said earlier and Hermes confirmed, this is intentional at this point.