Summary:

A user logs into a new Sage CRM 7.3 install and can not see the option to switch to the classic dashboard.


Resolution:

This is "By Design".
The classic Dashboards have been deprecated in Sage CRM 7.3.  A system upgraded from Sage CRM 7.2 would still have them but for a new install they would be unavailable to reference.


More information:

This will effect mobile themes in CRM if they have a dashbaord set up to display as the mobile themes use the classic dashboard.