How to Remove Transitions in Windows Movie Maker
Remove a Transition
After adding transitions, if you want to remove them, there are several methods to do that.
First, you have to select the transition you want to delete.
And then, click the “Rubbish bin” icon to delete the transition effect you have just selected.
Remove all Transitions
If you want to remove all transition effects, you can click the “Add to Timeline” button on top of transitions viewer and select "Remove All in Timeline".