Hi.
Best practice is typically not to allow the user to "save", via the file
menu or toolbar, but rather to create a submit data connection to a file
location since this way the naming of the form and the locatioin are
controlled and set.
I am not sure where you are "submiting" the form afterwards.

You need to create a field which will be used to store the form state.

So by default it is set to new. With your submit or Save button you would
add a rule to change the statefield to submitted or saved or whatever you
would like to use.  Then you can use this field and its value with your
conditional formatting.