What is the symbol ⋮ represents in project view?


What is “⋮”. ellipsis (three dots) vertically aligned mean on the right side/edge of track control line? It is disabled and when I click on it nothing happen.


It is an indication that the bar is adjustable. Click and hold then drag left/right.

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Is it in the manual? I haven’t seen this before.
Maybe it’s is new standard in UI design. It is nice.
Thank you.