Why is create index grayed out on Views but not Tables?

1

As above, on Tables it's not grayed out but on views it is grayed out?

2

Not all views can be indexed, and generally it's not something that's done using the GUI. Here's the documentation describing the requirements:

https://docs.microsoft.com/en-us/sql/relational-databases/views/create-indexed-views?view=sql-server-ver15