Your score appears to be re-flowing automatically across pages. You can change this,

https://usermanuals.finalemusic.com/Finale2012Win/Content/Finale/IDD_EDITOPTIONS.htm 

Thank you very much, that should fix it!

You can also use a hard page break. Choose the Page Layout tool and insert page break.

PB tool lets you define the page layout for your file, including the page size, size of the page margins, and the positioning of the systems on each page.

Thanks for the help. But I am still looking for a way to just lock the formatting of a page independent of the page number. For instance, if I need to insert a page somewhere it will throw off all the following pages (which may have varying numbers of systems) since the formatting is tied to the page number. 

Layout tool, Page Break. 

… if I need to insert a page somewhere it will throw off all the following pages …

What are your steps when you insert a page?

My first guess would be

Page Layout Tool.

Page Layout menu > Insert Blank Pages…

Is that what you are doing?

or ...
are you (more likely?) doing this? ...
Page Layout Tool.
Page Layout menu > Insert Staff Systems
(which will affect your page layout differently again)

and (this you probably know, but just in case) ...
it's usually best to work in scroll view (without worryiny abut any layout issues) until all your musical elements have been entered the way you want to. Only once you're finished with that, go to layout your pages as the very last thing you do.