How is Vacancy sensing mode achieved using a motion sensor in the Lumos Controls mobile app?

1. Go to the 'Groups' tab 
2. Go to the settings of the Group to which the Sensor has been associated and where the Vacancy sensing mode is to be configured
3. Go to Group Automation Settings -> Motion sensor settings -> select the required time period
   
4. Disable the option 'When someone arrives' 
5. Configure the required details for the option 'When everybody leaves'
   

Please go to the following link for more details: 

https://knowledgebase.lumoscontrols.com/knowledge/how-to-configure-a-group-for-occupancy-based-lighting-using-mobile-app-1 

You can also visit the following sections for more information:
To configure Daylight Harvesting, click here
To configure Scenes & Animations, click here
To configure Light Schedules, click here
To know how to Commission & Configure Sensors, click here
To know how to Commission & Configure Control Devices, click here
To know the Operations and Control details, click here