Here's the default wallpaper from the 2019 Notebook 9 Pro and Notebook 9 Pen up for downloading if you'd like. Link also in the comments. I posted this before a while ago
Amazing Laptop - Samsung For Laptop HD wallpaper | Pxfuel
Samsung Laptop Wallpapers - Wallpaper Cave
Samsung Laptop Wallpapers, HD Samsung 1366x768 Backgrounds, Free Images Download