White board and screen share issues with student

Hi, 

I tried using the white board today with a student.  I had previously practiced with a co-worker.  It seems that when I or my student hits share screen and then clicks white board a basic version pops up.  There is a pop up screen that asks if we want to download whiteboard app, use whiteboard app or continue with teams whiteboard.  I found the teams whiteboard to be very limiting.  So i'm trying to do the open in app feature but it's not seamless for my students with disabilities to use.  I noticed that I was able to see the galaxy pen writings, but then I moved the screen and saw that what I was typing was appearing on the first share screen.  This isn't helpful.  I want the student to see the galaxy pen and use the ruler and experience the re-veal and the spotlight.  Also, once we went back to using the basic version of whiteboard, we I noticed that there was a lag time between what I or my student wrote and when the other person can see it especially the text feature. There was also an issue when I stopped sharing my screen, my student couldn't see me anymore.  We even tried me leaving and coming back but they couldn't see me.  I realized there were now two windows of the teams meeting from when I shared my screen. How can I easily go between sharing my screen/whiteboard back to video.  Lastly, when my student is sharing his whiteboard or any screen, how do I stop him?  There was no stop presenting option since he was sharing not me.  

Thanks, 

Melissa