There's no windows options to share

Hi, 

Im trying to share a powerpoint presentation and i want to use the moderator mode, so i know that I have to share my screen with WINDOWS, not with desktop and not with Powerpoint. But in Windows there's only one option, it looks like i only have TEAMS opened (and i have my ppt opened). 

I have a Mac, so i dont know if it matters. 

Thanks