To resolve the typo in your search:

Mario + Rabbids: Sparks of Hope is a beautifully crafted, stable 30 FPS experience. Enjoy it for what it is – a tactical gem – and don’t wait for a patch that was never promised.

: On the standard Nintendo Switch, Sparks of Hope targets 30 FPS in both docked and handheld modes.

The Nintendo Switch hardware is already being pushed to its limits rendering the game's detailed environments and lighting effects at 30 FPS. Running the game at 60 FPS would require significantly more GPU power than the stock Switch possesses. Therefore, a simple "patch" from Ubisoft would likely result in severe frame drops and overheating for standard Switch users.