Anywhere in encounters i.e encounter forms that has a textarea is available to the Text Notes.
The difference between Nation Notes and Text Notes is T.N only allows text with no html or other stylings unless normally allowed in a text box.
The feature allows user to set up a set of canned messages along with all the other convenience feature of NN(Problem/Issues, Meds etc).
So if a form is loaded in the encounter context then Text Notes is available.
Turn it off at
This is actually a pretty popular feature once you get the hang of setting up templates which I know I could improve if motivated enough. You know a pecan pie, fried chicken or lobster. You get the idea!