By clicking on the Eye icon in the addres bar, or with the
cmd/ctrl m shortcut, you can switch to and from Focus mode. Focus mode puts a single pane centered in view. Using the pane resize functions, you can very quickly check out a site in many different sizes.
Additionally, using the "random pane" shortcut,
cmd/ctrl shift n, the pane will automatically resize to a random width and height. This is a good way to stress-test your website.
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