Check document now greyed out spell check

I am trying to spell check a novel. I have check spelling while typing and check grammar while typing ticked but want to just double check the whole manuscript but the check document now option is greyed out. Tried doing it for individual files and also greyed out. Probably really obvious but how do I do it?

Usually, when a tool is greyed out in the menu, it means that your cursor is active in the wrong place to operate that tool. To spellcheck your entire manuscript, click the Manuscript folder and view it in Scrivenings mode. Click the cursor into the Main Editor. Then you’ll be able to run the spelling and grammar tool.

Same goes for individual documents. You just need to make sure the cursor is active in the editor before clicking the Edit menu.