Open the "Settings" app on your Android device.
epending on your device's version of Android and manufacturer, the exact path to these settings may vary. Look for "Storage" or "Storage & USB" or similar options.
In the storage settings, you should see an option for your SD card. Tap on it to access its settings.
There should be an option to "Format as internal" or "Format as portable" storage. Choose "Format as internal."
You'll be presented with a warning that formatting the SD card will erase all data on it. Confirm that you want to proceed.
The formatting process may take a few minutes. Once it's complete, your SD card will be merged with the internal storage.
It's a good idea to restart your phone after the formatting process is complete to ensure that all changes take effect.