Spelling Option Grayed Out

I’m using version

The spelling option in the menu grayed out after I used it to spell check a document in a project. How do I get it back?

Many thanks!

Usually, menu items are grayed out when they are not valid in a specific context. Are you sure the text in the active Editor is ready to be checked and no other element in the UI has focus?

I only use spell check after I’ve finished working on a document.