For screen sharing I use Picture-in-Picture mode of my 43” 4K monitor (Acer DM431K) to give me a separate 1920x1080 screen to share when required. That way it is at the right size and resolution for everyone.
Yes. One HDMI 2.0 to give me 4K@60Hz and then one usb-c to HDMI (or is it DP) for the PiP.
Only one input on this specific monitor can do 4K@60Hz, all the others are 4K@30Hz or good refresh at lower resolutions.
Takes 20 seconds to enable the second display in display settings and then pick the right input for the PiP mode on the monitor (it has a remote). Most of the time I have my personal laptop displaying in the PiP frame lower right. The remaining 3/4 of the screen is my work area.
