It’s all about getting that div to sit higher than the rest so you can select it in the editor.
Maybe it’s been updated, I used to make a cms collection slider but this simple fix seems to work:
Try:
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Change the slider div to position ‘relative’ and set a high z-index this will make the image and edit button higher than the arrow section that is covering it.
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Then get the arrow div and give it a height of say 100 px so it doesn’t cover the slider div