Would you provide with some additional information about the change you have made?
- Where is this link added - in a Generic Content block or in any other (custom) widget?
- Could you provide the code used and/or a screenshot of the setting you have
If I correctly understand, this is a colorbox (jQuery lightbox) and there should be some dimensions settings in the code like: width, height, innerWidth, innerHeight, initialWidth, initialHeight, maxWidth, maxHeight, etc. which set this window width/height.
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