How to Rotate Stickers in Windows Movie Maker
You can rotate the Sticker in the preview viewer.
Select the sticker to edit, and click the "rotate" button.
In the rotate panel, you can select four types:
Rotate clockwise, Rotate counterclockwise, Flip Horizontal, Flip Vertical.
To rotate any angle of the sticker, input the number at the rotate field, you can set the angle from -360 to 360.
Click the "Return" button.