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How do I scroll up and down pages when Scroll Bar at right disappears?

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The (normal right side) Scroll Bar disappears from page(s) leaving no up or down scrolling control over up/down movement or content.

The (normal right side) Scroll Bar disappears from page(s) leaving no up or down scrolling control over up/down movement or content.

Chosen solution

I think this is a system behavior. If you try the third option, does that solve it?

Apple menu > System Preferences, then click General

Show scroll bars

  • See scroll bars based on the device you’re using: Select “Automatically based on mouse or trackpad.”

    If your device allows gestures, scroll bars are hidden until you start scrolling. Otherwise, they’re visible.
  • Hide scroll bars until you start scrolling: Select “When scrolling.”
  • Always show scrollbars: Select Always.

Source: OS X Yosemite: General preferences https://support.apple.com/kb/PH18803

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Chosen Solution

I think this is a system behavior. If you try the third option, does that solve it?

Apple menu > System Preferences, then click General

Show scroll bars

  • See scroll bars based on the device you’re using: Select “Automatically based on mouse or trackpad.”

    If your device allows gestures, scroll bars are hidden until you start scrolling. Otherwise, they’re visible.
  • Hide scroll bars until you start scrolling: Select “When scrolling.”
  • Always show scrollbars: Select Always.

Source: OS X Yosemite: General preferences https://support.apple.com/kb/PH18803