limit image sizes

Is there a way to add code that limits the number of thumbnails created when uploading an image? I don't really understand how Wordpress delivers images, so how many sizes I really need. For example, do I need images smaller than a 200x200 thumbnail for anything? I never upsize images because they look crappy, so I don't need anything that creates a thumbnail larger than my original. Nor do I want anything cropped. If I want a particular cropped size, I will do that manually. But do I need proportionally smaller images for better delivery? What I know I need beyond my original full-size image are: 200x200 thumbnail 400x400 (max for each side, so proportional) 400x600 (max for each side, proportional) Beyond that, is there something I need for fast, smooth delivery? What does Catch Gallery need to work well? I've tried using Stop Generating Unnecessary Thumbnails. For awhile that worked really well, but now it is creating all sorts of weird stuff and something is blocking the plugin dashboard so I can't change it (I have deactivated it now). These are examples of the weird sizes I am getting: Image 1: 40x40, 100x100, 197x197, 200x133, 200x200, 350x233, 400x267, 528x297, 860x484, 1200x514 Image 2: 40x40, 100x100, 197x197, 200x150, 200x200, 350x263, 400x300, 528x297, 860x484, 1200x514 I have more than 20,000 images on my website (I'm a photographer), so all of these extra sizes are creating a major inodes problem. Cindy https://explorationvacation.net/