-> xrandr -q
xrandr: Failed to get size of gamma for output default
Screen 0: minimum 320 x 240, current 1680 x 1050, maximum 3280 x 1200
default connected 1680×1050+0+0 0mm x 0mm
1360×768 60.0
320×240 60.0
640×360 60.0
640×480 60.0
800×480 60.0
800×600 60.0
1024×600 60.0
1024×768 60.0
1152×864 60.0
1280×720 60.0
1280×800 60.0
1280×1024 60.0
1440×900 60.0
1600×900 60.0
1600×1200 60.0
1680×1050 60.0*
1920×1080 60.0
1920×1200 60.0
3280×1050 60.0
The problem with a full screen/fit to window disappeared after Connection-Disconnect-Terminate. I have to renew all my terminals but both screens are OK, now.