When Adobe Reader is set to tabbed display, it should not display the tab previews in Windows Taskbar.
When the open PDFs are reasonably complex, such as a drawing, the Adobe Reader can't quickly process the generation of the thumbnails meaning a long wait to just get back to the previous document you had open.
Ctrl+click is a workaround for the time being, as suggested y another commenter.
When Adobe Reader is set to tabbed display, it should not display the tab previews in Windows Taskbar.
When the open PDFs are reasonably complex, such as a drawing, the Adobe Reader can't quickly process the generation of the thumbnails meaning a long wait to just get back to the previous document you had open.
Ctrl+click is a workaround for the time being, as suggested y another commenter.