To get more vertical space:
Of course, hitting F11 in the browser helps too, but this would still help (and most users don't use F11).
You can add some minor css to make it smaller, and edit it if you're on Server version
But it's illegal to remove it completely (if you want to make minor code changes, you can get rid of most of the content. But the "Powered by" bit and the link behind it MUST remain visible and readable)
This is not an answer but may help some:
You cannot remove the text:
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