Trouble with news blog site

I have a news blog site, and all of the posts get listed on a single page- there are 300+ entries listed and it takes forever to scroll, and for the page to load.

I have tried changing the settings to display fewer posts, but that doesn’t work. I think the theme may be overriding it. The theme is Deodar.

I went into the Theme Editor, and found where I can limit the entries per page, and that works, but only on mobile, and sometimes on desktop depending on browser. Also, if I do limit the posts, it does not allow me to see any old posts, there is no 1-2-3-4-5 type of archive that you would see on a google search for example.

Can anyone help me with this? Site is AlphaTech.news

The page I need help with: [log in to see the link]