The recommended approach for deploying certain pages in Order Management to approved mobile devices is to install the Salesforce mobile app from Apple Store or Google Play and save the pages with the options of both Desktop and Phone applied. The Salesforce mobile app is designed for easy data access on the go. You can view Order Management record pages on the mobile app, but you can'taccess its console features, like screen flows. To make a page available on the mobile app, you need to save it with the options of both Desktop and Phone applied in the Lightning App Builder. Reference:Salesforce Order Management,Mobile App Theme FAQ