How to create a all post page

generally, consider to create a page template https://codex.www.ads-software.com/Page_Templates like the pageofposts.php as described in https://codex.www.ads-software.com/Page_Templates#A_Page_of_Posts

adjust the html structure to match your theme;
to show all posts, adjust the query parameters to:

$args = array(
            // Change these category SLUGS to suit your use.
            'post_type' => 'post',
            'posts_per_page' => -1
        );

(not tested)

for theme specific suggestions, please post in https://www.ads-software.com/support/theme/origin (if that is your theme)

Thanks