When you login to Linnworks Mobile, the app will be set to work in your currently set Location in Linnworks > General Settings > My Location. You can change it in Linnworks Mobile by going into Settings > Current Location > and switch a location.
Linnworks Mobile will report all stock levels, display orders, pickwaves, stock moves and so on only for the currently set location.
Linnworks Mobile cannot be configured to work in Combined locations. All of its features are effectively location bound, with the exception of Dashboards.