PageSpeed generating thumbnail sizes and overusing inodes

When I go to Settings -> Media, I noticed a lot of settings for thumbnail generation for different sizes, this is consuming a lot of inodes on my hosting, so I was wondering how can I delete them and stop them from generating. And also, will stopping them from generating have any affect on the website? I tried going to functions.php and copying the recommended code from Add Custom PHP to theme option in the media settings, but that did not work

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PageSpeed doesn’t register any custom sizes. In fact, if you use dynamic thumbnails plugin that we recommend, custom thumbnails are generated only for the featured images.