Nanite is used in the scene but not supported by your graphics hardware and/or driver. Meshes will not render using Nanite

I guess you’ll have to update your Windows 10 to the latest version. This version lacks some DirectX 12 and Windows 10 features that Nanite needs. Follow the Microsoft link I posted here to download the Update tool to update it. It’ll fix the problem.

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Change value of r.Nanite.ProxyRenderMode from 2 to for example 0 in DefaultEngine.ini in Config folder of your project (City Sample). For me it worked without updating Windows.
Also if you create new project you can render Nanite meshes correctly because this command doesn’t exist in this engine config file by default.

Maybe you could try Nvidia GeForce Experience, It can automatically update the latest version.

How to remove this annoying message? I do not want to use Nanite at all, but I want to use UE5

I experienced the same issue. just upgrading from windows 10 (internal version 18363) to 20H2 (19042.1706) fixed it.