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Apostrophe key = strange white line. Faster scrolling in timeline panel ?
Hi, i started using Mac recently and there’s annoying white line at the bottom when I press apostrophe to show title safe are. (there wasn’t on windows) What is that? I was googling how to get rid of it, but didn’t find anything.

Second thing that bothers me is scrolling up and down layer stack in timeline panel. Is it possible to focus on first or last layer in the stack immediately, rather than scrolling with mouse through them all. I know it’s possible to select a layer and press X, but it only works if the layer is selectable.
thanks in advance!