Good morning,
limitation. like this: https://community.esri.com/t5/arcgis-experience-builder-ideas/make-the-popup-resizable-in-experience-builder/idi-p/1382594
I recommend you to use the feature info widget in a controller widget and set an action on your map widget that opening the widget as a popup instead of the original popup when you click on a feature. Just think to unactive the popup in map widget.
By this you can set the size of your popup like you want.
I second what @JasonBOCQUET said. Use the Feature Information widget then you have control over the size and placement.
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