Lock tool bars to the sides?

I’m trying to set up R6 like my R5. In R5 I drag a toolbar to the side the area turn purple, and it attaches. I’m not getting this behavior with R6. The toolbars will not adhere to the sides.

Got it.

Did you figure out you already had locking turned on?

Wasn’t that. It was really the delicate precise nature of mouse placement required to activate the process. Easy once you get it, but not so for noobs. I experienced the same trying to move tool icons when creating custom toolbars. Took me 20 minutes to figure that out.