Thank you, but I already setup this option....
But it doesn't help.

Any other idea?

Ok, I created now successfully a shortcut with pre-defined directory and pinned it to the Taskbar.

When I click on it then File Explorer opens,
However in the TaskBar a second, new Icon for File...

Ok, that means: Users can NOT add switches/parameters to existing, already pinned Shortcuts in TaskBar.

That means Win 10 is getting more uncomfortable: Users have ....

1. to create a shortcut...

Yes, I know the switches.
The question is WHERE can I enter them?

I don't want to open a terminal/CmdPrompt and type it in manually.

The switch should be added to TaskBar File Explorer...

In old Win7 users could place a shortcut on TaskBar then open Properties of this shortcut, go to "Shortcut" tab and enter

%windir%\explorer.exe /n,/e,D:\data

This opens (when clicked) Windows...