Step 2: Setup the Banner Size
Go to 'Design' tab at the top menu, click 'Page Setup'.
On the 'Slides sized for', click the drop-down arrow and select 'Custom'.
For a website banner or header image, I set the dimension to:
width: 18.67 inches
height: 5.33 inches
This may vary in different WordPress theme, so you can adjust it according to your own need.
Click 'OK' after the setting is completed.
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