Screen sharing disabled??? Need advice Mac OS

I was playing around with screen sharing a PowerPoint presentation and I noticed the powerpoint for the viewer was enlarged.  It was so enlarged that the viewer could only see a portion of the presentation.  So then I went down the rabbit hole of trying to change the settings.  -- Long story short, I don't know what all I clicked, but now when I click the "share screen" button, I no longer see the screen sharing options.  I cannot figure out what I did.  Does anyone know the standard screen sharing settings so I can go back?  Like reset everything to standard operating settings?