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Arch already has the nvidia drivers in the normal repos. You can just install them.

This isn't something Manjaro adds.

It seems that Garuda that's mentioned in this article does that.

Garuda's default theme is heavy though, but unlike MATE it supports scaling options between 100% and 200% which is critical for 4k screens. I wonder if it's easy to verify if Nvidia Optimus is working for my laptop's NVIDIA GeForce MX130.

Ubuntu has been packaging the binary Nvidia non free drivers for quite a few years now. There's an easy to use GUI app [1] to enable the non-free drivers, and switch between the different Nvidia driver versions.

[1] Software and Updates is the app's name I believe.