If you want to install apk from your aab to your device for testing purpose then you need to edit the configuration before running it on the connected device.
Go to Edit Configurations
Select the Deploy dropdown and change it from "Default apk" to "APK from app bundle".
Apply the changes and then run it on the device connected. Build time will increase after making this change.
This will install an apk directly on the device connected from the aab.