Hi @MarsMas, I am not exactly sure what you mean by a pinned favorite. Are you pinning a tab using the right click on the tab? Are you pinning a site to the taskbar using the More menu (...) -> More Tools -> Pin to Taskbar? Are you talking about clicking on a favorite on the favorites bar? Please let me know which scenario you are having difficulty with and which channel you are using.
I don't know if this reply is too late but to open favourits a single click is suffice. If you double click that will mean two clicks and one will open in current tab and other in a new tab. If you want to open only in a new tab please press Ctrl + left mouse click. If you want favourite to open in a new window press Shift + left click. You can do any of above also using right mouse click and choosing relative option. I guess you have already configured above by now.