This feature displays your concurrent sessions side-by-side, and you can easily navigate them by clicking the right and left arrows in the agenda.

After enabling the feature, check your agenda on the event page and virtual event hub. The sessions starting at the same time should appear side by side.

In the admin console's agenda, sessions that has the same start time would have a 3 dot icon that allows you to drag the session from one position to another. Click and drag that to change the order of your concurrent sessions.