Estimate Monitoring distance too short

Dear Estimate, currently we developing an app for region monitoring app and we experienced the distance for trigger the beacon monitoring is only 1m , even we set the distance to “.far” (<= 15m) with proximity beacons, is there any way to improve the distance to 3~5m at least ?

below are the core code block :-
locationMonitoringManager.startMonitoring(forIdentifier: “359ef442b475470e08c400d3467e8202”, in: .far) // left Wing
locationMonitoringManager.startMonitoring(forIdentifier: “964e8282b88c610a07f88e0dcf782e20”, in: .far) // Right Wing
locationMonitoringManager.startMonitoring(forIdentifier: “5a5916be4039b6e2fa32cace50b00801”, in: .far) // Middle