Hey @mvcalder-xbk, welcome to Streamlit!
Yeah, that message is a bit confusing. What it actually means is, “press ctrl + enter to send the value in this text_area back to streamlit”. In other words, when you press that key combo (or when the text_area loses focus), the browser delivers the contents of the text_area back to your script, which is then re-run with the new text_area value.
In your app’s case, the expected meaning “Press Enter to Apply” is clearly different from the above actual meaning, which is not ideal!
Unfortunately, there’s no way to suppress or change that message, but feel free to open a feature request in Streamlit’s Github repo. Alternately, we have an upcoming plugins feature (discussed on the Streamlit 2020 Roadmap) that will let anyone write their own frontend component that integrates with Streamlit, which will make tailoring this sort of thing possible.