How do I get to the Arp Category Search from the home page?

You would press [EDIT]
Then select the PART by pressing the PART SELECT button [1/1]-[8/8]
Select COMMON (blue in the lower left of the screen)
Select "Arpeggio" > there are three screens concerning the Arpeggio in the second column. "Common", "Individual", "Advanced"

You make your selection for this PART by selecting "Individual"

Alternate method:
From the HOME screen, touch box "TYPE/NAME" for the PART you wish to edit
A pop-in appears offering to "EDIT" that PART
Select COMMON in the lower left of the screen
Select "Arpeggio" > "Individual"

Once you touch one of the 8 positions, you will be offered to SEARCH by name or Number.

That's great. Thanks so much. 🙂

(Everyday I learn new things about this synth, and am enjoying it more and more).