Question about some button of the Home page

Hello guys, is there anyone that may advise the function of the button ‘Hidden’ & ‘Default’ in below screenshot?

And I know the ‘New’ button means I can see the newest post, right?

And ‘top’ button means I can go to the earliest post of the page, right?

And for ‘Default’ sorry I don’t understand it clearly…

Many thanks for your feedback

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