In the Play Store settings, we can specify the app download preference.
Apps can also be downloaded to the Huawei smartphone via the mobile data or only via the wireless network. This setting offers a little more control over the existing data volume.
We can select one of the following options

Android 10 | EMUI 10.0
Step 1:  Open the  Play Store
Step 2:  Open the  menu
Step 3:  Open the  Settings
Step 4:  Tap on  App download preference
Step 5:  Select  Over Wi-Fi only
Step 6:  Tap on  Done
  1. Open the Play Store
  2. Open the menu
  3. Open the Settings
  4. Tap on App download preference
  5. Select Over Wi-Fi only
  6. Tap on Done

Huawei Instructions