garageband song length
I am new to Garageband, and hopefully the answer to this is obvious! I have Garageband 10.1.4. I've been recording a song in songwriter and I am having trouble extending the track beyond about five minutes, the display of tracks just seems to come to a dead end. I have seen some posted solutions to this problem that indicate you drag something at the top right of the display but I can't find whatever it is.
GarageBand 10, OS X El Capitan (10.11.6)