How to stop Corel from stacking all opened files under its icon on the Taskbar of Windows?

What system adjustment will stop CorelDRAW 2020 from stacking under its icon on the Taskbar all files which are opened in it - so that I could close all of them with just a single middle mouse button click [instead of revealing a sub-menu with "thumbnailed" files], just like in case of [almost *] any other of my multiple programs that I happen to use and temporarily see on my Taskbar?

I am using version on Windows 10 Enterprise 20H2 x64 and have already tried adding to its Registry this

Windows Registry Editor Version 5.00


and this


when Corel was closed - and then resetting the system - but the behavior of Taskbar has not changed

This has been my long time issue, dating back to Windows 7

* This has been also happening with tabs opened in Internet Explorer