Yes, you can hide the title and renew/subscribe header bar by turning ON the 'Hide Title Header Bar' and 'Hide Renew/Subscribe Header Bar' settings.
Please follow the steps below:
- Go to the Mass File Download App.
- Click on the 'About Mass File Download' tab.
- Find the options for 'Hide Title Header Bar' and 'Hide Renew/Subscribe Header Bar' within the configuration settings.
- To hide the title header, turn ON the 'Hide Title Header Bar' settings
- To hide the renew/subscribe header bar, turn ON the 'Hide Renew/Subscribe Header Bar' setting
- Click on Save.

- With these settings enabled, the Mass File Download page will appear as follows:

PS: View Mass File Download, Salesforce file download app on Salesforce AppExchange: https://appexchange.salesforce.com/appxListingDetail?listingId=a0N3A00000EcsAOUAZ