@ffmfp_staff
@AARON_C is correct.
To clarify more:
Yes. Everytime you change something in the app you will have to publish it.
So, I will tell you the difference between save and publish in Power Apps.
Save will just make the changes for you or you can also say that the changes are made locally.
Publish would make changes globally and it would be available to everyone.
But publishing everytime is not the best thing to do, because that would just increase the version of your app.
So, what you can do in the future is.
Finish the app. That would be your 1st version.
Test the app. Make changes. Publish it. It will be your 2nd version.
Then the things left you can do a 2nd release of the app.
I know sometimes there could be minor changes as well, at that time you can publish the app too.
I hope this helps 🙂