Don't worry, Jimmy—your original Lenovo Yoga wallpaper is highly likely still tucked away on your laptop! When you do a standard Windows Reset, it strips away the factory custom themes and defaults to generic Windows 11, but it usually leaves the original manufacturer asset folders completely untouched behind the scenes.
To pull it right back up, open File Explorer and go straight to C:\Windows\Web\Wallpaper. Major brands usually create a dedicated Lenovo or Yoga folder right inside there to store their high-resolution launch backgrounds. If you don't see it there, press the Windows Key + R, type C:\Drivers into the box, and check through the subfolders—Lenovo frequently caches original system media and wallpapers there too. If all else fails, just fire up your built-in Lenovo Vantage app; running a quick scan or heading to its customization settings will usually let you download and re-apply your model's factory look with a single click!