Question How To get old dock on Big Sur

Basically you're wanting the dock to not have such big rounded corners / floating like Big Sur has.

cDock might be what you're looking for, but I don't own a Mac so I can't confirm.
 
How do I apply the themes? No apply button lol. Picture:


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I see. Right. Mac now looks like iOS.

Would do a feedback note to apple. Maybe they will consider making it a selectable option. Usually if enough people speak up about it they will make a change. But I do see that the rounded corners is/was a feature with Big Sur. Part of the new macOS.