lawnchair Layout Default vs Dock (Beta)

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What is the difference between lawnchair Layout Default vs Dock (Beta)?

When I use dock layout all apps shows on my homescreen but none can be removed from home screen

Default layout on the other hand doesn't show or add any installed app icon to home screen at all (even though I have enabled add newly installed icon to home screen in the setting).

Which one should I use?

thanks a million