If a Worker has a default location set, either from an Operator Movement, a default location for a shift, or by a location pattern you can see what location they are assigned to in the Configuration -> System -> Worker Settings page. This shows the Work Location they are assigned to by any of those means on the current date. It does not consider "Change Rostered Shift" modifications to the roster.
Additionally, the Roster Administration page shows the currently assigned Work Location for a Worker in the hover tooltip for each cell.
The Roster Administration page can also be grouped by Location.
And can show the Work Location codes and colours.