Configure popup size

@adm_b → Popup width is dependent on image size, and you can set the image size by adding an image style on popup image. follow the steps:

1. Go to the content type, where your image is used
2. Go to the Manage display tab
3. on Format dropdown you select Image Popup
4. Click on setting option, and go to Image Popup, and select your image style inside Popup Image style dropdown.
5. Now Popup will match the dimensions of the image you set inside image style

Ah, I see - I was using the Default image setting. I made a new style 1200 wide and now it's working. Thanks :)