After Effects Timeline too thin

Hi Guys, don't know if it's for a discussion or just a bug. 

I opened an AE Project today and for some reason, the timeline's really thin and I can't grab and pull it wider. Unfortunately, that problem has transferred to all other projects I open now, so I can't work. Reinstalling it didn't work either. I think the guy who was working on the project before was using a two-screen layout, so maybe the rest of the timeline is somewhere on a second screen? 

Thanks for any help!