I always find it confusing using the play/pause button, when I am sharing my presentation/screen.
Seeing the Play sign can means
or: Screen sharing is currently live/active
or: Press ‘play’ button to go live/active (but currently paused)
My suggestion is to use the green/orange color schedule to underline visualy what the Play button means at the moment Green=active session.
And Orange pause button means, presentation screen sharing is not live (only remaining to show last active slide showed). And thus feel free in the meantime to play around to prepare for next presentation slide, before pressing the play/pause button again.
I hope you find this an useful suggestion. Is this something you would like to consider for improvement?