To change the size of a thumbnail in Producer go to the standard theme options for the featured category block and scroll to options use cropper, image height, image width, image float. Using Featured Category #2 as the example:
1. Go to your WP dashboard
2. Click the Appearance tab then click Producer Standard Options
3. Scroll down to Featured Category 2 Settings and look for the following options in those settings
#2 Use Cropper?
Do you want to use crop the images in featured category 2? (Cropper is not guaranteed to work)
Image Width Set image width for featured 2 images Image Height Set image height for featured 2 images Image Float
Set image float for featured 2 images
If you want leave “Use cropper” set to off only the thumbnail width setting will be used and the height will be adjusted accordingly. If you want complete control over the width and height dimensions you should set Use cropper to “on”. The image will then be cropped to the dimensions you set for image width and image height. The image float setting allows you to decide if to float the image to the left of the content, to the right of the content or not to float the image at all. Selecting “none” will cause the image to appear on top of the excerpt. Left will cause the image to appear to the left of the excerpt and right will cause it to appear to the right of the excerpt.