This is specifically an issue when the Image Widget is in a Widget Controller. Setting the Image Widget's height and width to Auto seems to do the trick otherwise.
I imagine that there are plans for building a much more configurable dynamic Legend Widget someday for ExB, but the way things work right now the legend widget just doesn't work well enough in some cases. Sometimes a static image works better. I don't know how often the Image Widget is used within a Widget Controller, but we use it that way for showing legend images. The complaint I got was that the image looks fuzzy:
![image.png image.png](https://community.esri.com/t5/image/serverpage/image-id/8503iF8D1F4211391D3A2/image-size/large?v=v2&px=999)
![Future Development Plan Two Column.PNG Future Development Plan Two Column.PNG](https://community.esri.com/t5/image/serverpage/image-id/8502i2695EF596173551B/image-size/large?v=v2&px=999)
It would also be really nice if the pop-up would open at the size that would show the entire image.