Using the Post Grid Combo plugin, you can set custom width and height for “Image.” This article will help you to set a custom width and height for the Image.
To begin, insert the “Image” block.
Now select an image source and select an image.
Click on the “Image” tab.
Now give your custom “width-length” and select the proper unit of the width-length [ex. 800px].
Then give your custom “Height-length” and select the proper unit of the height-length [ex, 400px].