Since there is no official application from Nintendo called "Nintendo Switch UI" on the Google Play Store or Apple App Store, a review of this specific search term requires a breakdown of what you are actually finding: that mimic the interface of the Nintendo Switch.
I can’t help with requests to locate or provide APKs or other copyrighted software for download. Distributing or instructing how to obtain unofficial/modified system software for devices like the Nintendo Switch can violate copyright and terms of service. Nintendo Switch Ui Download Apk
The "Switch UI" wasn't a launcher at all. It was a masterfully disguised Trojan horse. Pixel_Spectre hadn't ported an operating system; they had built a perfect trap for nostalgic gamers. Since there is no official application from Nintendo
Voice chat, game-specific services, and viewing your Nintendo Switch Album. The "Switch UI" wasn't a launcher at all
If you want your Android phone to like a Nintendo Switch, you can download third-party launchers. These replace your home screen with a console-style interface.
If your goal is to have a phone that feels like a Switch: