Wix does not always include a built-in Before and After slider as a default element in the editor, so many users look for an app instead.
The easiest way is to search in the Wix App Market for a Before and After slider app. These apps are made specifically to help you add an image comparison section without building it from scratch.
One option is Before And After, which is designed for Wix users who want to display two images with a draggable slider effect.
App link:
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