Coming up in the next release of Opus Primus will be a much better implementation of pagination to move between list of posts. If you would like to get the feature now, please feel free to grab the latest release from the Opus Primus GitHub repository.
To get a sneak peek at what this will look like just scroll down to the bottom of the list of posts on the home page. Previous versions of the theme would have had a much more simpler navigation method just using text links of “Previous Page” and “Next Page”.
If you want to revert back to the plain text links of previous versions this is actually fairly easy to do. I would suggest starting with creating a Child-Theme so any changes you make to the theme will be update safe. I wrote an article a while back that may be helpful if you have not created a Child-Theme before. You can find it at WPFirstAid.com.
All you have to do is copy and paste the following line of code into your Child-Theme’s functions.php file:
add_filter( 'opus_navigation_pagination', array( 'OpusPrimusNavigation', 'posts_link' ) );