Map and stat screens down the right side of the gameplay window. Thumbstick inputs for the touchscreen gimmick stuff in Dawn of Sorrow.
There's almost nothing in this that you can't get out of just plugging these roms into MelonDS. Hell, the Definitive Edition patch for Dawn of Sorrow is better, removing the touchscreen elements and anime portraits.
Wow, what a lazy port. See, I'd love to play a remaster of these games that actually re-evaluates the functions of the second screen, working those features into a single 16x9 screen experience. Nope, they'll just awkwardly squish the second screen in there like how every DS game is emulated. How hard would it have been to put a semi-transparent minimap over a corner of gameplay like a bunch of Metroidvanias do?