Window won't split

[DCW]

I'm trying to split the viewing window, but the option is grayed out.
Anyone know why this is and what to do about it?

Thank you in advance.

 

[buffyslay]

it looks to me like your workbook is 'protected'?

(TOOLS / PROTECTION / (UN)PROTECT WORKBOOK)

:

 

[DCW]

No. I'd already examined that. I should have noted that up front.