We don’t read minds. What is the problem?

https://makemusic.zendesk.com/hc/en-us/community/posts/215729367-General-Discussion-House-Rules 

‘CM7’— the chord tool icon. How is it that someone in the coding/graphics departments know what that means. How is it possible that the program doesn’t know what it means? I didn’t buy this program so I could teach it what it should already know. I wouldn’t pay a plumber so he could hand me the tools and have him ask me how to do the job. Win 10

I'm sorry you are disappointed in Finale. Finale is a well established music notation program used around the world. It never was, is not, and likely will never be a music theory instruction program, although music teachers do use it in a variety of ways for instruction. If you don't recognize a chord symbol or know how to use chords in a pop or jazz milieu, Finale will not teach you that. If you pick it up from experimenting, all the better; but Finale is no better a tool for learning that than a granite tablet and chisel would be apt for coding.

A Google search quickly tells us that CM7 is a C Major 7 chord, as opposed to Cm7 which is a C minor 7 chord. Apparently, you're going to have to do a bit of that if a chord name as basic as CM7 throws you. No harm in that, you'll learn a lot.

Since I don't know what country you are from, I don't know how to spell the chords out for you. B, H and Bb having different meanings depending on language.

As Adrian pointed out, it's a Notation app, not a music theory course.