Unable to flip a clip horizontally in iMovie 10.1.6
Solution 1:
If I understand your question correctly, you can do what you want as follows:
- Select the clip
- Click on the icon you called the 3 overlapping circles
- Click on the Clip Filter option
- In the Choose Clip Filter window that appears, select the Flipped filter
- This will now film your clip horizontally
I've created a visual diagram of steps 2 - 4 below:
