You can choose between 3 image sizes or you can hide images.
Note: this only applies to to the images displayed within the app and has no effect on the exported image size.
If you don't need to capture images then click here to learn how to hide this field.
To change the image size:
Access the Settings page and scroll down to the "Items" section then tap the "Image Size" row
Next, tap the option you would prefer from the list