As you read through the Privacy Sandbox on Android documentation, use the Developer Preview or Beta button to select the program version that you're working with, as instructions may vary.
Display the Privacy Sandbox user control UI
Privacy Sandbox on Android allows device users to control whether the
Privacy-Preserving APIs (PPAPI) and the SDK Runtime are enabled on
their own devices, or not. As of Developer Preview 5, the setting to display the
user control UI is disabled by default. For development and test purposes, you
may want to enable the user control UI. To enable the user control UI, use the
following adb
command:
adb shell am start -n com.google.android.adservices.api/com.android.adservices.ui.settings.AdServicesSettingsActivity
By default, the user control is set to disabled on the device. To enable the Privacy Sandbox API and SDK Runtime, on the device, tap the toggle button.

Enable the Privacy Sandbox on the device
While the previous section enabled the device user to choose whether they wanted
Privacy Sandbox running on their device, this section explains how a developer
can enable the APIs on a device using adb
commands.
Enable the PPAPI on the device
Enable the PPAPI
adb shell device_config put adservices ppapi_app_allow_list \"*\"
adb shell device_config put adservices ppapi_app_signature_allow_list \"*\"
adb shell device_config put adservices adservice_system_service_enabled true
adb shell device_config put adservices adservice_enabled true
adb shell device_config put adservices adservice_enable_status true
Disable the PPAPI
For development and test purposes, you can enable or disable PPAPI access on the device by running the following commands:
Set to false
to enable:
adb shell device_config put adservices global_kill_switch false
Set to true
to disable:
adb shell device_config put adservices global_kill_switch true
Enable the SDK Runtime on the device
adb shell device_config put adservices disable_sdk_sandbox false