problem with infinite SEO not updating URL


i have the infinite SEO on two sites, but it does not update the sitemap URL - and there is no way for me to change it...

I have tried deactivating then deleting then re-installing but the "URL to the XML Sitemap" never changes from the original - which is now wrong for both sites... can you advise how this can be updated to be correct?

it is important as one of the changes is i changed the url to https - but sitemap still shows http version, which will cause issues.