Close the OCLC help screen. Note that when you opened this MARC editing interface, that it actually opened in a new tab in the program. If you look near the top of the screen, you’ll see a CAT0 and a MARC1 tab. You can click back and forth between your initial search and the MARC record you’re looking at. You can also open multiple records, each in their own tab. Go back to the search screen (located in the CAT0 tab), right click on another record, and open it in another tab:
So, now I have another tab, MARC2.