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@Pokem TwlBg is the software that's running on the 3DS in DS mode, which among other things handles screen scaling from DS to 3DS resolution, input, etc. It's necessary to patch your TwlBg in order to have it scale the screen to widescreen (among other patches), as documented by Sono in this thread. Sono's plan is to release a patching app for 3DS eventually which will pretty much automate the process of patching TwlBg, but he has released a preliminary 64-bit Windows build in the meantime.
Even if you're not using TWiLight Menu++, the instructions in the TWLMenu++ thread ("3DS/2DS: Playing in Widescreen") will help you through the process of patching your TwlBg. If you're following the steps from that thread, then once you've created your patched TwlBg.cxi by running wide.bat, you can stop following them and just put that file into sdmc:/luma/sysmodules on your 3DS SD card, and enable external FIRMs and modules in the Luma3DS settings (hold Select on startup).
Now everything you run in DS mode will display stretched to 384*240 on the top screen--even if the game has no widescreen cheat. So any game you use a widescreen cheat with will display correctly, while any games without a widescreen cheat will just look stretched out.
Even if you're not using TWiLight Menu++, the instructions in the TWLMenu++ thread ("3DS/2DS: Playing in Widescreen") will help you through the process of patching your TwlBg. If you're following the steps from that thread, then once you've created your patched TwlBg.cxi by running wide.bat, you can stop following them and just put that file into sdmc:/luma/sysmodules on your 3DS SD card, and enable external FIRMs and modules in the Luma3DS settings (hold Select on startup).
Now everything you run in DS mode will display stretched to 384*240 on the top screen--even if the game has no widescreen cheat. So any game you use a widescreen cheat with will display correctly, while any games without a widescreen cheat will just look stretched out.