How can I disable the name tags above the mobs and how can I make mobs spawn only above a specific level?

[ghost]

I checked the configuration files but couldn't find the option to disable the name tags above the mobs. Which option should I use to disable it?

And next, I would like mobs to spawn only at high levels to make the game more challenging. How can I disable weaker mob levels?

[stumper66]

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