Find your app apk file (you can also use apk extractor to get an apk, but I didn't try it. this is just the downloaded apk of sudachi). click on quick edit
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In the package name you will see the original apk package name - in my case it was org.sudachi.sudachi_emu.ea Change it to any package name that Samsung identifies as a game. I choose yuzu's package name because I happened to have the apk on my phone. So I changed it to org.yuzu.yuzu_emu and hit save. You will get a new apk file (it creates a new copy - not overwriting the original). Install the newly created apk
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And when you open the app you should see the game booster icon in your notification tray! Notice, because the package name is different this will usually let you install 2 instances of the same app - so in my case I had 2 sudachi apps installed. One activated game booster and one didn't. This is useful because you will need to export all of your save files from the old instance and import them to the new one.