Problem
Technicians cannot see Pricebook Pro on their mobile app.
Solution
Technicians are assigned to specific categories in the pricebook that are marked as Hide in mobile. This setting prevents them from seeing the Pricebook Pro on their mobile devices.
Note: Depending on your account's configuration, you might see one or more of the following:
Items and Pricing instead of Pricebook.
Customer instead of Homeowner.
Procurement instead of Inventory.
The names are different, but everything works the same way. For more, see Commercial Personalization Platform - FAQ.
Make Pricebook Pro visible in mobile
Go to the navigation bar and click Pricebook.
In the side panel, click Categories.
Locate the ServiceTitan Pricebook Category and look for a checkbox or a setting that says Hide in mobile.

Click the checkbox to remove the Hide in mobile setting.
Ask the technician to Sync changes and Download Pricebook on their mobile. This step makes sure the changes you made are updated in their app.