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On the right side of the separator you see what applications you recently opened. This is a parameter that can be modified in the 'Dock' settings.
More specifically, non-pinned apps you opened. Pinned apps stay on the left, whether open or not. – Tetsujin – 2018-12-19T07:42:56.870
Aren't those the active tasks to the right? – Tony Stewart Sunnyskyguy EE75 – 2018-12-19T00:20:15.870
@TonyEErocketscientist no, as you can see in the screenshot i have safari spotify and chrome open but they are on the left. – mc-lunar – 2018-12-19T03:14:59.483