Hmmm I assume the user you are logged on as is an administrator, I think you need to have admin rights to change this.
If you are, then I am not sure I can help you much, the below worked for me.
Right Click on WindowsApps Folder > Security > Advanced
This opens another window ( Advanced Security Settings for WindowsApps)
Next to the owner I clicked on change which opens another window and I changed the owner to all administrators from there.