Hi, if you have converted images from jpeg to webp with my plugin, you can go to image processing and click on restore. This way you restore the images as they were originally.
Otherwise you can try disabling “convert to webp” in the configurations.
However the plugin only converts images to jpeg which will have a lower weight than the original image.
If you need to convert all the images from webp to jpeg, I advise you to look for a plugin that does this specific job or you can search among the wordpress cli commands.