Where did my archives go?

Hello ,
I am having trouble with my archives… if you go to https://www.hornbag.net/archives it takes you to a page with some not all of my posts.
I would like it to look like https://mtdewvirus.com/archives is this a standard WordPress setting or is it a plugin?
What I am trying to do is eliminate the list of months on the side menu and have one link to an ‘archives’ page where all of the searching and stuff can be done from.
Many Thanks!