How to change image size on listing and single listing page?

WPL is using an internal extension called "activity" for creating page sections. Activities have a config form, so you can simply configure them based on your theme requirements.

For changing image sizes on the listing (property listing) or single listing (property show) pages, you should use the WPL activity manager. Please click on "activity manager", search for 'gallery' and edit desired activity. You can then change the image sizes.

Please check the following screenshots:

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