So I've been working on this video, and I rendered earlier versions of this project with no problem. However when I go to render it now it only renders a single frame. I think I accidentally clicked something that tells the program to only render the one frame. The top of the timeline is all greyed out excepted for the one little frame that's blue, I know that everything up there should be white, Idk what I did to make it like this and I don't know how to undo it, does anyone know what's happening?