In this post you are going to see how to add mirror effect to your video using Movavi video editor plus 2020

First drag & drop the video on timeline, play it to check.
Click on effects, scroll to see the effect name.
Or type it in search box.
Or click on adjustments filter & scroll little.
Drag & drop the mirror effect on video on timeline.
Click on the play button to check it.

Remove
Under clip properties click on remove button next to effect name to remove effect from video.

Same way you can try other mirror effect.