There is no direct setting in MDM to disable screen lock during active use for Android devices, however if your devices are in Device Owner Mode, you can use Kiosk Mode to lock the device to a specific app or set of apps.
Android Kiosk Mode in Systems Manager - Cisco Meraki Documentation
I am not a Cisco Meraki employee. My suggestions are based on documentation of Meraki best practices and day-to-day experience.
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