Remove Gray Pin icon from Quick access Navigation Pane

I know it's old thread but i couldn't now in update 1909. Can you help me please

For those interested, I was trying to do the same thing and I was able to come up with a solution. Basically I just edited the icon file located on "C:\Windows\SystemResources\imageres.dll.mun" with Resource Hacker, replaced the ugly pin icon with a transparent one and then replaced my edited file with the windows one. Note that you'll have to disable permissions and take ownership of the folder, because windows, by default doesn't allow you to edit windows files.

If anyone is interested here are my modified file:
imageres.dll.mun - Google Drive

And a brief tutorial teaching how to edit/replace windows files:
YouTube