I would look for a Doze or Sleep option in your battery settings. For me on a Samsung I have to go pretty deep to find mine. For my Samsung the steps are Settings>Battery and device care>Battery>Background usage limits>Sleeping apps or Deep sleeping apps
You may also be able to just open Settings and try typing Sleep or Doze in search bar and find something.
Then you would just need to add the app to one of those lists and it shouldn't wake up until you actually open the app for use.
One additional thing. I have the Sam's app but don't have this issue. Is this new, did it recently start happening? I ask because I wonder if clearing the cache or app data might fix it. Maybe something is stuck in there and stopping it from closing correctly.