The old "image viewer" had an obvious flip/rotate setting. It does not look like the new viewer 3.26.1 does. Its help menu says to use the edit setting, but I cannot find it.
In the help file there are three methods mentioned. Methods 2 and 3 worked for me.
- Flip a picture
Edit menu - I could not find it either.
- Rotate a picture
when the window is focused and the mouse is over the image, two bent arrow buttons should be visible at the bottom. Click either to rotate in the direction indicated. You can then save the rotated image.
- Keyboard shortcuts
Rotate Clockwise Ctrl+R
Rotate Counter Clockwise Ctrl+Shift+R