App creen scrolls differently since factory reset + restore

A

AC Question

I reset and then restored my Nexus 5 today.

Prior to restoring, the App screen let me scroll left and right to swipe between the icons. Now since restoring the App screen scrolls up and down with a Search Apps box at the top of the screen.

My Nexus 9 tablet swipes left and right.

All updates etc installed.

Any ideas why the App screen scrolls up and down now instead of right and left.