MIDI Guitar 2 IOS

How do you stop MIDI Guitar 2 from staying open in the background of my iPhone X? It is draining my battery. Does “swiping” out of the app stop it?

from home screen, swipe up from the bottom to the top… now all apps are displayed…
to completely stop an app then: swipe it up and out of the screen


Yes, I learned from the Apple Store that the procedure to close apps in the background, from IOS 12.2, is to swipe up and hold at the center of the screen. This will show all background apps and then you may swipe to (selectively) close any or all apps.