Can't remove space after the End Marker when using Horizontal Zoom Slider.

One Logic Pro project I'm working on started putting space after the End Marker even when I zoom out fully with the Horizontal Zoom Slider. It just started doing this. Not sure if I hit something by accident. Attached is a pic of the project with the extra space after the End Marker, and another pic of a project that is acting normally, with no extra space after the End Marker. I know I can fit-to-screen using the Horizontal Fit To Screen button in the top right, but I wan't to use the slider and normally it works fine.

I also double-checked, and there are no regions or automation past the End Marker.

Any ideas what I can do to change it back?

Thanks.