Good workaround but Plex HTPC menu is a comparatively terrible UI for PC monitor use vs Plex for Windows, especially for 21:9 & 32:9 monitors.
Found this post that works for Plex for Windows. Doesn’t have the preset jumps but does the ± adjustments fine:
Really would love it to be a default feature where it auto crops in when in window mode and when in full screen, detects your monitor resolution and knows to crop in on the top/bottom black bars all the way, or until the left/right image is at the edge. My movies & TV are from disc so they have black bars encoded for everything not 1.78:1.
