I agree that is a bit of a usability issue... I'll do something about it in future builds.
For the time being, there are a couple of workarounds available. If the package list has input focus (the orange rectangle is shown around an item), you can press Shift+PageUp to scroll quickly to the top. Also, if you enter something in the search field that isn't found the list will be quickly cleared, revealing the X button.
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For the time being, there are a couple of workarounds available. If the package list has input focus (the orange rectangle is shown around an item), you can press Shift+PageUp to scroll quickly to the top. Also, if you enter something in the search field that isn't found the list will be quickly cleared, revealing the X button.