Explanation

Default permissions for guests are restrictive by default. Guests can be added to administrator roles, which grant them full read and write permissions contained in the role. There is one additional restriction available, the ability for guests to invite other guests. Setting Guests can invite to No prevents guests from inviting other guests.
User1 is assigned the User Administrator role. Therefore, User1 can open the Azure portal, view users, create new users, and create new guest users.
In the exhibit, the 'Guest user permissions are limited' is set to no. This means that guest users have the same permissions as members. However, the 'Guests can invite' setting is set to No. Therefore, other guest users (all guest users except User1) can open the Azure portal and view users in the same way as member users can.
Reference:
https://docs.microsoft.com/en-us/azure/active-directory/b2b/delegate-invitations
https://docs.microsoft.com/en-us/azure/active-directory/fundamentals/users-default-permissions