There is currently no way to make images appear larger in the popup window. The images are sized 200x150 pixels whether the pop-up is default size of full screen. It would be great if we could adjust the size of images in the pop-up window!
This article may be helpful to those looking for increased control over image size in pop-ups: https://support.esri.com/en/Technical-Article/000019312
Hi @MatthewSwain! This Idea was implemented with the ArcGIS Pro 3.5 release. To see what else is new in the world of ArcGIS Pro pop-ups, checkout the What's new in ArcGIS Pro 3.5 documentation and the Your Ideas in ArcGIS Pro 3.5 blog on Esri Community.
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