Docking Panels?

I always have my standard Panels on the right side of the Rhino workspace. They went away on my last opening of Rhino and even though I can get floating panels, they just don’t doc on the right side. I searched the help topics but haven’t found anything. How do I doc panels on the right side?

TIA

If you’re using Rhino 5 for Windows, you should be able to drag a panel from it’s title bar to get it to dock against the right side. If this isn’t working, make sure you click and drag from the left side of the title bar.

Thanks…after about 20 tries I managed to get it to doc.