Epson WorkForce Pro WF-M5799 Workgroup Monochrome Multifunction Printer with Replaceable Ink Pack System - Manual (Page 209)

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You see a window like this:
Note: If you want to use a scan job that you created instead, select it from the Job list in the
Document Capture window, click the Start Job button, and skip the rest of these steps.
4. Select any displayed scan settings you want to use.
Note: See the Help information in Document Capture for details.
5. If you want to select detailed scan settings, close the Scan Settings window, open the Scan menu at
the top of the Mac desktop, and select Displays the EPSON Scan Setup Screen .
6. Click the Scan icon and select any detailed scan settings you want to use from the Epson Scan 2
window.
7. Click Scan .