switching between projects

I like to switch between projects using the arrow keys on the upper left of the timeline, but it gets cluttered when I open multiple timelines. Is there a way to clear the old projects so I can start anew? If I'm working with just two, I don't want to have to click through others to get there. It's always fresh when I open the program for the first time and then starts getting cluttered. Does this make any sense?

thx

You can hold down the arrow and jump to any previously opened item. Or close the app and relaunch it.

I didn't realize holding down the arrow would do that - duh. Thanks!