Sony PCG-TR5MP Hardware Manual page 93

Hardware Guide
7 Deselect the Extend my Windows desktop onto this monitor option.
This will disable the Dual Display.
✍
For switching from Primary to Secondary display, see the section Selecting display modes (VGN-A series)
Connecting peripheral devices
(page 86) / Selecting display modes (PCG-TR series)
n N
92
(page 87).