Not all features supported!

I need help. why don’t I see full set of features on my iOS, Android or Android TV OS (Example- like share my screen, speaker status and more). Doe’s Jitsi support all its features only on a browser running on a Windows or MAC OS? Could anybody help me out with this?
Thank you.

Screen sharing is not available on the mobile apps or browsers, to my knowledge. See :

Thank you, Magic Fab. That answers my question.