Yes, you can hide the Libraries and CSV subtabs by following the steps below:
- Go to Mass File Upload App:
- Open the Mass File Upload app from the app launcher.
- Navigate to the About Mass File Upload Tab:
- Click on the About Mass File Upload tab.
- Access Screen Settings:
- In the Mass File Upload Screen Settings section, locate the toggles for "Hide Libraries Tab" and "Hide CSV Tab."
- Turn ON the Toggles:
- Turn ON the toggles for both "Hide Libraries Tab" and "Hide CSV Tab."
- Save the Settings:
- Click on the "Save" button.
- A success message will appear on the screen.


With these settings in place, you will only see the Records subtab on the Mass File Upload page.
PS: View Mass File Upload, Salesforce file upload app on Salesforce AppExchange: https://appexchange.salesforce.com/appxListingDetail?listingId=82cf236b-1ee8-4ea7-aebf-fd0c89fb93bd