BigBlueButton lock room layout setting doesn't seem to work properly

Hi,

we're unable to lock the BBB-layout for participants in the room. Could you check on this? it may be that we simply missed out what should actually be locked when the setting is activated Moodle-wise. It is no show-stopper but since the feature is offered we'd like to understand it.

Thanks!
Wiebke

Reproduction:

Tested in Chrome Version 91.0.4472.101 / Firefox 78.11.0esr

1. Create BBB meeting room via moodle plugin

2. In the Lock settings check the box for "Lock room layout"  (or set bigbluebuttonbn_lockedlayout_default = yes in the site administration)

3. Join the BBB meeting room as participant, move the webcam around the slides, adapt the with of the shared notes area, hide presentation slides.