I should have been able to find my answers, but I can’t! I’ve got the ACF Pro version. I’ve created some custom fields, all good. I cannot figure out how to create an options page, or even what it’s supposed to do.
Adding that code should create an additional menu on the backend. I’ve attached a screenshot for your reference.
After that, you can set your field group location to the newly created options page. I’ve attached another screenshot for your reference.
If you still have an issue with it, I suggest you open a new ticket and provide temporary admin credentials to your site. You can open a new ticket here: https://support.advancedcustomfields.com/new-ticket. Also, please don’t forget to explain the issue again and provide the link to this thread.