Select the field on the Salesforce object that will determine the name of the folder on a new record. For example, if you select the Name field on Account, the Account's name will become the SharePoint folder's name.

NOTE: The 'Task' or 'Event' objects behave differently than other Salesforce objects. To set the folder name field for these objects, you will need to set your folder name field on the 'Activity' object and input the API name of this field into the Folder Name Field Override.

To view or change your Folder Name Field, go to Salesforce Setup > Custom Code > Custom Metadata Types > click 'Manage Records' next to SharePoint Object Settings and select your object.