If you're using or are looking to use the out of box My Approvals applet in the new ServiceNow Agent app you may notice that it is created a bit different then other applets you create. The reason for this is that the App is pulling data from three different data sources (REQ,RITM & CHG) rather than a singular table.

This means that in order to update the fields and structure you need to follow an approach outside of the studio for determining which fields you want to display for your end users. To learn how to update the oob fields, follow the below.

First, search 'mobile' and select 'Mobile Applications.

Next, you will see a list of all of your Mobile Applications. Select your My Approvals app.

Select your My Approvals folder

After you click My Approvals, you will see the different applets/screens belonging to that folder. Click Pending Approvals.

Here you can see that the app is pulling from three master items/three tables. If you want to disable approvals for change requests for example you can disable that here.

To modify the fields that show for any of these tables, select that particular entry. In this example I clicked the Requested Item entry. You will then need to click the Pending Approvals screen.

Finally, you will see the out of box fields that will display. The if you want to hide any of these just change the Hidden value to True. You can also add fields to this list by selecting new.

Hope this helps & if there is a better approach let me know!