Remove the "Work Order Line Items" from the Salesforce Field Service Lightning Mobile App

To remove the Work Order Line Items from the Field Service mobile app, follow the instructions below:

Desktop:
- Login to the Salesforce org as a System Admin
- Go to Set up
- Go to Object Manager
- Search for "Work Order"
- Access the page layout assigned to the service resource or technician user profile
- From the page layout, remove the “Work Order Line Items” related list
- Click Save

Mobile:
- From the field service mobile app,
Clear Cached Metadata (Profile > Settings > Advanced Settings > Clear Cached Metadata)
(OR)
Log out and Log in to reflect the metadata changes in the field service mobile app