What does the "Show More" Button Do?

Show more buttons loads more posts without reloading the page through ajax. I think its not working probably your blog doesn’t have enough posts for it to work.

I’ve got over 350 posts.

Can I have link to your site please.

https://www.nosaintshistory.com

Yes I see, didn’t notice , thanks for reporting will fix it as quickly as possible and launch a new version with the fix.

Okay fixed and uploaded the new version, it would be a couple of weeks for it to be available for update. However you can download it manually and update from here if you want.
https://www.ads-software.com/themes/download/supernova.1.6.3.zip

Thanks for the fix.
By the way really like this theme.

OK Sayed, seems to be working fine now.

Thanks again.