Does anyone know why my 2 other users don’t have the same items on there phone app. For example no mileage

There are features only available to master admins, userdavid5.

For example, in mileage, only master admins can automatically track mileage in QuickBooks Online. 

However, other users can manually add trips in QBO.

1. Sign in to QuickBooks Online in a web browser.
2. Go to the Mileage or Trips menu.
3. Select Add Trip.
4. Add the trip date, starting and ending locations, distance, and the purpose.
5. Select Save.

Here's an article for more information: Automatically track mileage in QuickBooks Online.

Let me know if you have additional questions about mileage tracking.