After perform Windows 8.1 Update, Windows Store apps now have close and minimize buttons and one can always access taskbar from Store apps by just moving mouse cursor to bottom edge of the screen by default. This article show you the steps to disable shows running Windows Store apps on the taskbar.
Step 1: Switch to the desktop environment.
Step 2: Right-click empty space of the taskbar and click Properties to open Taskbar and Navigation properties.
Step 3: Under the Taskbar tab, uncheck the Show Windows Store apps on the taskbar checkbox.
Step 4: Click the Apply button and close Taskbar and Navigation properties.
NOTE 1: Uncheck the Show Windows Store apps on the taskbar checkbox won’t prevent you from pinning Store apps to the taskbar and apps that have been pinned to the taskbar will continue appearing on the taskbar.
NOTE 2: Show Windows Store apps on the taskbar feature only available in Windows 8.1 Update and not available in Windows 8 and Windows 8.1.