Showing more than 10 entries on Blog main page

I am assuming this must be some piece of code that I need to go back to modify, as I added an 11th post to my blog at https://resumerelief.com/blog/ today and the 1st/oldest entry vanished.

I'm assuming there's some setting or code that's making this happen and I'd like to remove this limit so more than 10 entries can be listed on my blog's main page.

Can someone point me to the file I need to update and the piece of code I need to change?

Thanks!