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Windows 10: Taskbar buttons for UWP (Metro) applications remain on the taskbar

Problem description

CASE 1: Taskbar button for any UWP (Metro) application remains on the taskbar when application is minimizing to tray.

CASE 2: Does not work the following option for Favorite of UWP (Metro) apps:
Favorite's options > Hiding > Hide task bar button

Solution

Not resolved yet.