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Scrool Bar within Tree Style Tabs

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How can I remove the added scroll bar within the Tree Style Tabs. I don't want it, it takes up space, and is unnecessary. Is there a way to remove it?

How can I remove the added scroll bar within the Tree Style Tabs. I don't want it, it takes up space, and is unnecessary. Is there a way to remove it?
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Add the following to Tree Style Tab settings > Advanced > User Style Sheet:

#normal-tabs-container {
  scrollbar-width: none;
}