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How do I reduce the width of my folders sidebar?

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How do i reduce the width of the sidebar in my email screen. The "folders/ searches/ tags" sidebar is twice as wide as it needs to be.

How do i reduce the width of the sidebar in my email screen. The "folders/ searches/ tags" sidebar is twice as wide as it needs to be.

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What webmail site has this problem (e.g., Outlook, Yahoo, Gmail)? A volunteer with an account on the site could take a look.