Flexible vs Strict Round Robin

By default, the app suggests the next user as the user with the fewest number of meetings to date based on the rules you setup.

Flexible Round Robin 

If the queue is flexible the user can "skip" the suggested user (the user with a star by their name) and select other users in the queue manually to book a meeting.

In this example - Nate was suggested as indicated by the star as the next Assignee but other Assignees could be chosen

This setting is helpful when you want to give your users the option to make other selections. This is what the setting looks like in the queue settings:

Strict Round Robin

In the case of a strict round robin:

The user can't select other users, they can only select the next user in line to receive a meeting.If the prospect wants to book a time that's unavailable for the next user in line, they have the option to select Availability for all

In this example, Gaines cannot be skipped but the booker can choose "Availability for All" to blindly pick a time for a different rep