right click menu icons
I think they might be referring to icons next to menu items in the right click menu.
I think those icons can be handy sometimes, but I find them to be massively overused in KDE especially, to the point that it feels visually overwhelming sometimes. Having zero icons at all in GNOME might be the other extreme, but I appreciate how clean it looks.
Blender using icons strategically to visually group related items is probably the best of both worlds.
OBS could do that, I suppose. Add a screen capture source, and place a color source behind it sized 10px larger than the screen capture rect. Hit record.