Bookmark Ace extension

Not connected.

Connect

Bookmark Ace address

Advanced: Paste a token instead

Only if Connect to Bookmark Ace doesn’t work for you: in Bookmark Ace open Settings → Connected browsers → Advanced, make a token, and paste it here.

Token

Panel on the wrong side?

Your browser decides which side its panel docks on; extensions cannot change it.

Chrome: open chrome://settings/appearance and set Side panel to Show on left.
Edge: open edge://settings/sidebar and look for a left or right option (not every version has one).
Firefox: open the sidebar’s header menu and choose Move sidebar to left.