I have the same problem and I really can't figure it out. I opened a new
workbook, copied the sheet I wanted into it, and the custom view option was
unavailable.
That sheet has a table on - could that be something to do with it?
Yes, if you have defined an excel table anywhere in the workbook, the
custom views option will be unavailable ... if you convert the tables
to normal ranges, custom views will be available.