Next to "eContacts Settings" click "Manage".

On the "eContacts Settings" page, click "Edit".

Click "Use Custom Layout" to use custom layouts for Leads and Contacts on the "Continue to OCR" screen in the Scan app.

Click "Use Custom Enhancement Layout" to apply custom layouts for Task, Event, and Case Salesforce enhancements within the Scan app.

Select "Save" to finalize and confirm the changes.

For the change to take effect, users of the Scan app should either restart or reset the app settings.

How Enable Custom Page Layouts in Salesforce