Hello! I understand you're experiencing constant alarm issues with your Libre app. To assist you best, could you please share a bit more detail? Are the alarms related to signal loss, glucose readings, or something else? Also, is this with the FreeStyle Libre app or LibreLink app on your Mac running OS X 10.15.7? Any additional info will help me guide you more effectively.

Meanwhile, here’s a general approach that usually helps resolve constant alarms with the Libre app:

1. Check Alarm Settings:
Open your Libre app and verify that alarm settings are configured properly. Sometimes alarms may be triggered if notification settings are too sensitive or all alarms are enabled by default.

2. Keep the Device Close to the Sensor:
Signal loss alarms could occur if your device drifts too far from the sensor (generally needs to be within about 20 feet or 6 meters), or if there are obstacles or interference blocking the Bluetooth connection.

3. Ensure Bluetooth Is On and Permissions Allowed:
Since the app uses Bluetooth to communicate with the sensor, make sure your Mac’s Bluetooth is enabled and the Libre app has permission to use notifications and Bluetooth.

4. Restart the App and Device:
Completely close the Libre app, then restart your Mac to refresh the system processes. Relaunch the app afterward.

5. Update the App:
Ensure you have the latest Libre app version installed, as updates often fix alarm and communication bugs.

6. Sensor Issues:
Sometimes the sensor itself may be damaged or expired, leading to false or constant alarms. If possible, try with a new sensor to see if the alarms cease.

If these steps don’t resolve the problem, I can guide you to deeper troubleshooting, such as checking notification categories or examining specific app logs.

Does any of this match what you are seeing? Let me know what you have tried so far or if you need help with any specific step!