It's at an unfortunate saddle-point of off-the-beaten-path and undiscoverable.

Contrast Blender, which does its own thing too but has an infobar at the bottom continuously trying to give context-appropriate hints for the current keybindings.

Meanwhile, there's a keyboard shortcut for "anchor floating layer." Where will you find it? Not by hovering the button that anchors floating layers, that's for sure.