Minimize the options for participants

Hi, I am the administrator of our account. I would like to minimize the options for the participants of our meetings, so that they have no options (buttons at the bottom) to play with. I tried to deselect many options in the admin part, but users still see buttons like White Board, AI Companion, ...

Do you know whether there is a way how to display the vital functions only, like video & mic? Thanks for your help!