Displaying featured image in image slider instead of full size

Hi there! I just upgraded to Catch Evolution Pro. Before that I used the featured post slider to show my images on my front page, using the normal way of posting and linking the corresponding image to the featured post slider. Since my upgrade I only want to show images that are not included in posts, but uploaded independently. Before I used the "Post Thumbnail Editor" plug-in to determine the displayed part of the image and it worked great. Now with the featured image slider this seems not to be possible anymore. All of my pictures have definitions for the three sizes of thumbnails and for the two versions of featured slider images. But with the image slider now I can only choose one of the square thumbnails or the full size of the picture but not the nice horizontal featured slider format. What do I have to do to display all my images in the same horizontal format with the same size as it was possible in the featured post slider?! Thank you very much!!