Got it back...

Seems that the "Dock" function had docked it off the screen.

I reduced my window to about 200 x 200, and changed the settings again, so it saves and docks...

This time, when I hit "Show Browser", it threw my ThinAir window aligned to 0,0 on the screen. The main area was in the top-left. When I pulled it back to the center, the "Browser" pulled out of the side-screen, attached to the client.

If it is attached LEFT, the POS X,Y of the main client should be minus the width of the browser window. At-least on CHANGE VALUE of that setting. I was expecting something like the advanced mode, where the work area was going to be split by a moving divider. However, That setup works fine. It moves with the screen, so now I can slide it out of the way, without the browser covering the screens behind it.

Thank-you Eros, an Petr