Help with new DEX in ONE UI 8

[msovalle]

Hello!
I as a long time samsung dex user, just upgraded to a new galaxy tab S11 and I am having some hard time to "fine tune" my experience as my old configuration. Can you please help me?

1. When using Microsoft EDGE or Chrome in an external monitor,  I can see my open tabs only when explorer is in FULL SCREEN mode. If its in MAXIMIZE, it does not show the open tabs. Any help?
2. How can I do to "turn" the screen OFF the tablet and keep working in my monitor? Before I was able to be working in my monitor and have the tablet screen off.
3.  I am not able to change the sound output device. Before I was able to select monitor speaker or table. Now, i am unable to choose between sound output devices!

Please help!
Thanks,
Galaxy Tab S11 Ultra 
Galaxy S25 
#one ui 8