I have my synth rack on the right hand side of the application window as I have done for quite a while now.
 
When I undock the synth rack, there is no option visible to redock. The undocked window exceeds the desktop width and goes off screen. The application should be smart enough to keep the undocked rack within the desktop visual parameters.
 
Right now, the only visible portion of the synth rack after undocking is from the synth tab then left. Everything to the right of that synth tab id off the desktop.

Hi. Do you use dual monitors? If so, do you have them mounted side by side, or on top of eachother?
All the best.

   ?? - Not sure I understand.  If you can access the upper right corner of the Synth Rack (or Browser), click on the little down arrow to access the docking options.

Can't comprehend why anyone would want to "undock" the synth rack, but if you drag it somewhere until the screen area turns blue, it will re-dock, unless you holding down the Ctrl key.

I use dual monitors and they are side to side. when the rack is undocked, the entire window should focus inside the desktop or application. In this case it does not. You should not have to drag the rack window to access any buttons. They should be there without manual intervention. 
 
Regardless of why anyone would want to do it, you are able to and it should behave.  ;)

Guitarmech111
I use dual monitors and they are side to side. when the rack is undocked, the entire window should focus inside the desktop or application. In this case it does not. You should not have to drag the rack window to access any buttons. They should be there without manual intervention. 
 
Regardless of why anyone would want to do it, you are able to and it should behave.  ;)

Agreed. A lot of people I suspect do not realise about the buttons because of this.
It's been like this for as long as I can remember.
It's hard to say whether this is a bug or a feature request. Somewhere in-between is my call, I would still file a problem report.