The alarm function of the Huawei P20 Pro is probably used by almost all users and therefore you want to change the alarm tone, which sounds at the set alarm time.
By default, the sound is "Aegean Sea" and you are sure to want to change it now. This works as follows:
Change alarm tone on the Huawei P20 Pro
1. Open the clock app
2. On the Huawei P20 Pro. Touch the alarm clock where you want to change the sound
3. Go to "Sounds" and select either one of the pre-installed sounds or a music stored on your smartphone.
If you have made a selection, it will be taken over and the alarm clock will ring with the selected alarm tone at the next alarm.
You now know how to change the alarm tone for the alarm on the Huawei P20 Pro.