Decrease number of bars on GarageBand Mac project

I used the triangle (upper right corner of screen) to add more than the amount of bars needed to record a project. Now want to remove extra bars that were recorded upon. I use the triangle to move a line to the end of the tracks which will stop the song at the proper bar, but the extra bars remain in view on the screen. The project/song will end playing at the proper place but there is still empty bars appearing on the screen. I expand the project's tracks to fit the screen, but beyond the tracks, still lies the original 200 tracks I first set up. Example: I set the project up for 200 bars. Now recorded, the project is only 100 bars long. How do I get rid of the extra 100 bars? Should I just ignore them or is there some way to totally remove them for the project's screen?

Garageband IOS does this with a window that allows you to enter the total amount of tracks for the song. You may use auto to make sure you get the whole recording then turn off auto and enter the exact amount of bars the recording takes, after the recording. Anything like that in Garageband Mac?