Overlapping vids

I have created a longer project with a series of short overlaps that fade in. Now I need to add another video in between in the chain so I need to drag the last video back apart. But it seems once the vids are overlapped, they can no longer be moved back apart, unless you use the undo button which will pull off the last one but only if you have not saved the project, which I have. Is there a way to drag the video back apart?