I know how to use windows and the setting you mention above is reset on startup (edit, probably because it's a work computer). It also doesn't solve the actual problem. Here's a better description: https://superuser.com/questions/1766815/is-there-a-way-to-make-a-folder-open-in-a-new-tab-instead-a-new-window-in-window

And the solution is.... It is not natively possible to make tabbed explorer work as it should.