Hello! I understand your FreeStyle Libre 3 Plus app is frozen in the "save" mode. Let's work together to get that fixed.

To start, can you tell me if you have already tried closing the app completely and reopening it? Also, is your phone connected to the internet and is NFC (Near Field Communication) enabled? NFC is important for the FreeStyle Libre sensor to communicate with the app.

Meanwhile, here is a step-by-step guide to try:

1. Force close the app: On Windows 10, you can press Ctrl + Shift + Esc to open Task Manager, find the FreeStyle Libre 3 Plus app in the list, select it, and click "End Task" to force close it.

2. Restart your phone: Sometimes a simple restart helps clear any stuck processes or memory issues.

3. Check NFC settings: Make sure NFC is turned on in your phone’s settings since the app needs NFC to save data from the sensor.

4. Reopen the app and try saving again: After these steps, open the app again and attempt to save.

If the app still freezes in the save mode, please let me know if there were any error messages or if the sensor itself is properly placed and working. We can then explore clearing app cache or checking for app updates without uninstalling, as reinstalling can invalidate your sensor.

Also, let me know your exact device model and if the app was recently updated or if this problem started suddenly.

Does this sound okay to try? Are you able to perform these steps now?