I want to give a user access to the Term Store Management of a site collection and I noticed that I can add multiple people to the Group Manager field. So I tried it and the user can access this page, but only if he or she specifies the direct URL, which is https://mycompany.sharepoint.com/sites/Websitecollection/_layouts/15/termstoremanager.aspx.
However, when this user opens the website settings, the Term Store Management menu item is not visible... I find it very inappropriate that only the direct link to the Term Store Management can be used.
Is there a user role that can access the Site Collection Term Store anyway? Or how can I include the link in the websitesettings of the websitecollection?