What does the white wrench symbol by the mileage indicator mean on my 2021 Lexus UX 250

Please consult your owners manual. I think you'll find it means the vehicle is due for scheduled maintenance. Consult your local dealership service department if you do not have your manual - they can answer the question directly and tell you how to resolve. Such a new vehicle has so many resources available to you as the owner -- make sure to read up on your vehicle's features and instrumentation so that you'll have the answers to many possible questions you'll come up with in time.