Reset DB

Hi, i added some new image attributes to my theme function file. If i activate the plugin the old settings are back and my images are unsharp,- so can you please tell me how to reset all plugin settings in my DB? I would like to re-index my settings from the function.php

Sincerly Yours

Deexgnome

https://ww.wp.xz.cn/plugins/simple-image-sizes/