Ask HN: Best way to share a portrait-mode screen?

I like to work with my monitor in portrait orientation. The problem is, I'm often sharing my screen or recording Loom videos, and it's exceedingly difficult for others to read my screen or see whats going on.

Are there any solutions here, like sharing a region of my screen only, and dragging windows into it? I can always just share a single window, but when I switch apps I have to share the new window.

How are my fellow portrait-mode people solving this?