Keynote Presenter Display Not Working on External Monitor

How to fix it

// try these in order, the most common fix is first

1. FIX 1Switch from mirroring to extended display

   Copy steps
   1. 01Open System Settings > Displays
   2. 02Select the external display and set it to 'Extended display' instead of Mirror
   Did this fix it? Yes No

2. FIX 2Swap the slideshow and presenter screens

   Copy steps
   1. 01Start the slideshow
   2. 02Move the pointer and click the display options button in the presenter display
   3. 03Choose Swap Displays
   Did this fix it? Yes No

3. FIX 3Use Play Slideshow in Window

   Copy steps
   1. 01Choose Play > Play Slideshow in Window
   2. 02Drag the window to the external monitor and make it full screen
   3. 03Keep presenter notes on the laptop (useful for Zoom: share only that window)
   Did this fix it? Yes No

4. FIX 4Lower the external display resolution or update macOS

   Copy steps
   1. 01In System Settings > Displays pick a lower resolution for the external screen
   2. 02Install the latest macOS point release
   Did this fix it? Yes No

Symptoms

The slideshow appears on both screens with no notes on the laptop, the presenter view shows on the projector instead, or the slideshow takes several seconds to appear on a 4K display.

Why it happens

• C-01Displays set to mirror instead of extend
• C-02Keynote set to show the slideshow on the wrong display
• C-03macOS 26.x display bugs with external monitors
• C-04High-resolution extended displays on lower-end Macs

// this guide also covers

• keynote presenter display not working
• keynote presenter view not showing
• keynote presenter notes on laptop
• keynote external monitor
• keynote presenter display macos tahoe

Other Apple Keynote errors

• Keynote Not Opening or Crashing on Mac
• Keynote Export to PowerPoint Broken (Fonts & Animations)
• Keynote Video Not Playing in Presentation
• Keynote Remote Not Working on iPhone
• Keynote Not Syncing With iCloud Between Mac and iPad
• Keynote Collaboration Not Working
• Keynote Presentation Can't Be Opened (Too Old or Damaged)
• Keynote Slow and Lagging With Large Presentations