When a new SharePoint user attempts to integrate with SigningHub, the default settings will be shown to them as a pre-selected account settings in the available settings list. They can however change the selection and choose any other available settings or provide their own settings to integrate their SharePoint and SigningHub accounts.
In case, if no Enterprise user marks their account settings as default, SigningHub itself picks those settings that are available on the top of the list for a new SharePoint user. However, the user will still have the option to either go with the system's suggested settings or provide their own.
See the below screenshots for the reference. Select a setting from the list and click the "Validate" button and then "OK" to use them for integration or click "Cancel" to specify your own settings.