how to force an AD sync?

Hi there

 

I've recently started managing a site with a Sophos XG Firewall and am having a bit of trouble with some basic functions and I'm not finding the interface very intuitive.

The Control Center tab says that the version is XG85 (SFOS 16.05.5 MR-5) 

 

I have an AD connector located under Configure - Authentication - Servers and that is reading in a few groups from AD and a bunch of users.

If I remove a user from one of the groups in AD and add them to another group in AD, the change doesn't seem to reflect reliably in the Sophos.  Sometimes it comes though in a few minutes, but one I'm trying to change at the moment has been over 2 hours.

 

How do I force it to synchronise now?