Thanks so much for using Dynamic News and sorry for my late reply here, missed your thread somehow.
The header image on your homepage can be cropped when you upload a new image in the Customizer. You can then cut the image as you like.
For featured images, the theme defines a fixed image size and WordPress will automatically resize all images. If you want to change the default image sizes of Dynamic News, you can do so with the Simple Image Sizes plugin. You can download it on https://wordpress.org/plugins/simple-image-sizes/
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