We can set the preferred download method for apps in the Play Store settings, which will determine whether apps are downloaded as follows:

Android 10 (MIUI 12.0)
Step 1:  Open the  Play Store app
Step 2:  Open the  menu
Step 3:  Open the  Settings
Step 4:  Tap on  App download preference
Step 5:  Choose  Over Wi-Fi only
Step 6:  Tap on  Done
  1. Open the Play Store app
  2. Open the menu
  3. Open the Settings
  4. Tap on App download preference
  5. Choose Over Wi-Fi only
  6. Tap on Done

Xiaomi Instructions
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