I like to work with multiple Trays in Sketchup and when I arrange the Trays, if I accidentally un-dock a tray the only way I found that can activate the re-docking feature is to:
right click on the tray
select manage trays
close manage trays
move tray where I want it to dock.
This seems strange that I have to go through these extra steps to activate the docking feature. I believe in SU 2022, simply dragging the Tray around would activate the docking feature automatically.
Let me know if this is just on my systems or a glitch.