Customizing navigation items

I don't want all the Resources to show up in the left menu..

I checked the docs and it says:

protected static bool $isHiddenInNavigation = true;

protected static bool $isHiddenInNavigation = true;

protected static bool $isHiddenInNavigation = true;

protected static bool $isHiddenInNavigation = true;

I added these flags and also fully cleared the cache, and they're still showing

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