For any user-designed multiple choice, it is possible to use a dropdown menu, radio buttons, or checkboxes.
For the predetermined fields, we are constrained to only use dropdown.
I would love to change, say, “Duration”, to radio buttons. Why? Because currently MOST of my bookers completely miss that they can control the duration in your current UI/UX flow. I think that make all the options visible as radio buttons would address this problem.
It would make it clearer, when they are about to confirm, that they can adjust the duration of the meeting, if they had not realized it so far.