how to stop my edit board from moving while trying to edit

sorry first time

No worries. These stupid forums lead you to believe you are posting about a particular app or category, but all we see is Catalina or Mac OS.

When you said "edit board" without any context of iMovie, I had no way to figure that out.

If I knew you were referencing iMovie, "edit board" would have likely made sense.

But, I'm with babowa. I'm not sure what part is moving on you. You drag clips into the "edit board" and the already inserted clips move around. If you wan to drop a clip into the middle of another clip, you may need to split that clip where you want to drop the new clip.

well, not sure what your actions are there, but the window is dynamic meaning you can move the clips around or rearrange them. here is a link that might be helpful

https://support.apple.com/imovie

What is an "edit board?"

what device?

which Mac OS or iOS version?

which app?