To remove the Pin to Quick access option in Windows 10, which you will find in the context menu under the Open in new window option, follow the steps below:
Go to Hkey_Classes_Root > Folder > shell > pintohome.
Make a backup of the latter key or the entire Registry before proceeding.
Right-click on the pintohome key and then click on the “Delete” option.
Click the Yes button on the pop-up.
That’s all. You can now see the changes in the context menu.
Note: If you want to get the option back, restore the backup that I suggested in the steps above.