Remove Inventory Tab from Field Service Lightning (FSL) Mobile App

To remove the Salesforce Field Service "Inventory" option from the FSL mobile app, follow the instructions below:

Desktop:
Step - 1:
- Login to the Salesforce Org as a System Admin
- Go to Setup
- Go to Object Manager
- Search for "Service Resource"
- Access the page layout assigned to the service resource/technician user profile
- Remove the “Location" field from the page layout
- Click Save

Step - 2:
Please check that the service resource does not have any Locations with their record

Step -3:
- Go to Setup
- In the quick find, search for "Permission Sets"
- Access the "Field Service Mobile Licence" permission set
- Go to "Object Settings" and remove access from "Product Transfer" and "Product Requests"

Step-4:

-Please ensure the service resource profile does not permit "Product Transfer" and "Product Requests". You can follow the following steps-
- Go to Setup
- In the quick find, search for "Profile"
- Access the "Service Resource" Profile
- Go to "Object Settings" and remove access from "Product Transfer" and "Product Requests"

Alternatively,

The 'Inventory' tab can be removed or deleted using the 'Field Service Mobile App Builder' feature. Please refer to the documentation here.

Mobile: From the Salesforce 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