Comment by tpmoney

macOS seems to have a “lock direction” for trackpad scrolling on zoomed in windows. Whether you like this or not is in my experience largely a function of how much you do normally do a diagonal scroll. On the one hand it means if you scrolled in to fill a column, you don’t need to be perfectly precise with staying up and down to scroll up and not also scroll the column off to one side. On the other hand if you don’t start with a very explicitly diagonal scroll, it won’t let you scroll diagonally without stopping and starting again.