clicking camera window on one pc selects camera, on other pc enlarges it - how to change?

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Young grasshopper
Mar 26, 2018
84
9
I have BI installed on two computers.

On one computer I can click a camera window and the camera is selected allowing me to PTZ. I double click the window and the cam is on temporary full screen.

On the other computer I click a camera window and this window is now the enlarged main camera (along all other cams as small windows).

Where is the setting so the other computer behaves like the first one, only selecting the camera but not enlarging it?

In BI Settings the Solo selected camera display is set to 1-up selected camera on both computers. I looked through the BI settings on both computers and they seem to be identical.
 
Top of the BI window. The double circle with a 1 in it. Click it. Gray makes it full screen and Green makes it a larger window with the other cams showing.