When multiple documents are open in tabs, if my Windows taskbar is configured to never combine taskbar buttons and hide labels, there is a taskbar button for every document, but nothing happens if I click on any of them except the first one (which is the currently active tab).
It should be fixed so that when I click on one of the other buttons Adobe Reader is raised and switches to the appropriate tab.
Or else the behaviour should be changed so that there is only one button on the taskbar (https://acrobat.uservoice.com/forums/926812-acrobat-reader-for-windows-and-mac/suggestions/39686770-acrobat-reader-dc-shows-multiple-tabs-as-windows-o).
Or you could do both and have an option to choose which behaviour the user prefers.