Assuming you already installed the Windows 10 IoT in your Pi 3 and that it is currently up and connected to the network, you can open the Windows 10 IoT Core Dashboard, go to the “My Devices” tab and find your device listed there.
If you now click the “Open in Device Portal” option, the browser will launch, ask you to login with your credentials, and then show you the “Home” page of the Device Portal.
On the bottom you will find the “Display Orientation” option:
Given my touch screen is placed upside down, I changed this setting to “Landscape (Flipped)”, and after rebooting the device I noticed that it flipped the touch screen display as requested, but it didn’t also flip the touch targets (so you’ll need to mentally rotate every point you touch on the screen to make it do what it is supposed to do)!
Under the hood, what this setting is doing is adding
display_rotation=2 to the Raspberry Pi “config.txt” file, but that’s not the proper way of doing this for the touch screen!
After reading the Raspberry Pi Display troubleshooting, I realized that one should use
lcd_rotate=2 instead, which will rotate the lcd display and touch targets!
So the fix is quite easy: just open the
\\<your-pi-ip-address>\c$ network share, go to the “EFIESP” folder and inside of it, find and edit the “config.txt” file!
display_rodate entry and add
lcd_rotate=2 to the end of the file, save, reboot the Pi, and that should fix the problem completely! :)