How many Office 365 Group can Outlook for Mac display on Mac?

There seems number of Office 365 Groups can be displayed in Outlook on Mac, 10 groups only. A Mac user reported this  to me and I tried to replicate on my own Mac and I got the same number.

Note that License installed is Office 365 Subscription.

Now if this is the case, can I select which group to display on Outlook?

Thanks in advance for the feedback!