Dock zones cause floating tab mayem :-(

[Walter Soyka]

Where you grab the floating window determines whether you will simply move the window or dock it into the rest of the UI.

If you grab the Mac OS-looking UI element (the gray bar with the traffic light icons), you will move the window. If you grab the Adobe-looking UI element (the Align tab itself), you can dock it.

https://helpx.adobe.com/after-effects/using/workspaces-panels-viewers.html#main-pars_heading_4

Walter Soyka
Designer & Mad Scientist at Keen Live [link]
Motion Graphics, Widescreen Events, Presentation Design, and Consulting
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[David Honan]

Thanks Walter, yes I can see this now, just a few millimeters below where I was clicking has fixed it!