Microsoft recommends that you use roles with the fewest permissions. This helps improve security for your organization. Global Administrator is a highly privileged role that should be limited to emergency scenarios when you can't use an existing role.
The compliance admin can specify which SharePoint sites to include for data loss prevention. If there are different sites specified for Syntex and data loss prevention, the maximum number of sites will be enabled for OCR. You won't be charged twice for processing.
Under Files and content, select Automate content processes with Syntex.
On the Automate content processes with Syntex page, select Go to Syntex settings.
On the Syntex page, in the Document & image services section, select Optical character recognition.
On the Optical character recognition panel:
a. Choose the site or sites on which this service should be enabled.
b. To restrict user access to this service, under Select the SharePoint libraries where you would like to enable optical character recognition, select No sites or Selected sites (up to 100). Follow the instructions to either select the sites or upload a CSV listing a maximum of 100 sites. Be sure to add your content center site if you want it to be included. You can then manage site access permissions for the sites you selected.