Oh my lord!!! That is so … (gritting teeth - you fill in the blank)!

Only fields on the page layout are accessible.

Welcome to professional edition.  No field level security, so Salesforce decides the only way to turn on a field is to put it in a standard layout…   Yes, I will fill in the blank. 

PS I like the new office.  Looks bright and shiny! 

I wish I had a dedicated office space, but no. I was at the car dealership for service on my van. The office I was in was an unused office that I used without permission while waiting on the service to finish.