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A subtle change to Apps view
Windows 8.1 introduced a plethora of changes to the Start screen and to Apps view, the official name of the screen that shows all installed desktop programs and Windows Store apps. The Personalization options on the Tiles menu get one extra choice after Windows 8.1 Update 1 is installed. When "Show more apps in Apps view" is switched to Yes, the icons to the left of each entry in the Apps list shrink in size, allowing the screen to accommodate more entries without scrolling.
You've got (new) apps
In Windows 8, installing any new desktop program or Windows Store app added that program's icons to the Start screen, resulting in icon overload. Windows 8.1 changed that behavior so that the new program's icons were added to Apps view but not automatically pinned to Start. That led to a different sort of confusion, with users puzzled over how to find the newly installed apps. The spring 2014 update adds a notification at the bottom of the Start screen, alongside the arrow that leads to Apps view. On the Apps screen, icons for newly installed apps are marked with a bright label that reads "New."
Disk space at a glance
One of the few changes in PC settings with Windows 8.1 Update 1 is this new pane under the PC and Devices entry. The Disk Space list shows which types of files are gobbling up the most disk space and offers a button for emptying the Recycle Bin.