A single ctrl-b comments line as expected. A 2nd ctrl-b uncomments the line.
Shift-ctrl-b does nothing unless text is selected, in which case it encloses the text in /* */. You have to reselect the text to include the newly added */ in order for a 2nd shift-ctrl-b to undo the commenting (or obviously use Undo or manual delete them).
It would be nice if the Table Filter window was consistent with the Editor behavior or vice versa. I find the Table Filter behavior rather slick - ctrl-b once -> comment, ctrl-b again -> uncomment - though I don’t use the /**/ comments very often.