For the Built-in app or Third-party app:
Method 1:
realme UI 6.0 & 5.0 & 4.0 & 3.0: Settings > Apps > App management > Select App > Clear Storage data or Caches.
realme UI 2.0 & 1.0: Settings > App management > App list > Select App > Clear Storage data or Caches.
realme UI R & Go & T & S & U Edition: Settings > Apps & notifications/Apps > App info/See all apps > Select App > Clear Storage data or Caches.
Method 2:
Long press the App icon > App info > Storage usage > Clear Storage data or Caches.
For the system apps (Like Download Manage, Software update, etc)
realme UI 6.0 & 5.0 & 4.0 & 3.0: Settings > Apps > App management > Click on⠸ > Show system > Select App > Clear Storage data or Caches.
realme UI 2.0 & 1.0: Settings > App management > App list > Click on ∶ > Show system Select App > Clear Storage data or Caches.
realme UI R & Go & T & S & U Edition: Settings > Apps & notifications/Apps > App info/See all apps > Click on ︙> Show system > Select App > Clear Storage data or Caches.
Related article:
How to use phone manager to clear storage