Smarthings locating

Unfortunately, you cannot manually increase the tracking radius, as it is limited by Bluetooth signal strength (roughly 30–50 feet). If your phone isn't detecting them nearby, it’s likely because the case is closed, which often puts the earbuds into a "sleep" mode to save battery, shielding the signal.
To improve detection:
Enable "Find My Device" to see the last known location.
Keep firmware updated via the earbuds' app.
Toggle Bluetooth on your phone to refresh the scan.
Unless the case has a dedicated tracking chip, detection will always be slower while they are docked.