If the Xiaomi Watch S5 46mm does not display notifications, please refer to the following steps to troubleshoot:
1. Check if the watch is properly connected to the phone via Bluetooth.
2. Check whether App notifications are enabled within the Mi Fitness App.
3. If the phone's system settings do not grant notification permissions to the App, notifications will not appear on the watch. Please enable notification permissions for the App in the phone's settings.
4. If DND mode is enabled on your watch, notifications will not be displayed. Please disable DND mode and try again.
5. The watch will only receive notifications properly if the App is locked in the background on your phone.
6. Try restarting Bluetooth and the Mi Fitness App, then resynchronize.
7. Try to disable Battery saver on the phone.
8. Try restarting the phone and watch to clear temporary system issues, and then re-pair the phone and watch.