Follow these steps to change the cover image:
- From the WordPress Menu
- Media -> Add New
- Drag and Drop the new image
- Wait until you can see the thumbnail of the image
- Appearance -> Customize
- Header Banner
- Button “Add new image”
- Choose the image from the media library
- Follow screens to Crop and Save
- Button “Publish”
Note: WordPress always leaves the original uploaded image file and only works with copies. Everything can be undone if necessary.