You can activate or deactivate the sound you hear when you start your device in the settings.

Android 10 | EMUI 10.0
Step 1:  Open the  settings
Step 2:  Tap on  Sounds & vibration
Step 3:  Tap on  More sound settings
Step 4:  Tap on  Startup sound
  1. Open the settings
  2. Tap on Sounds & vibration
  3. Tap on More sound settings
  4. Tap on Startup sound

Huawei Instructions