Thematic Category 1

Settings > Journal > Categories > Edit

In OJS 3 you can create Categories to organize your articles into thematic collections and provide another way for readers to access your content. Categories can be displayed as a browse block on your journal site and readers can select a category to view all articles in that category.  You can order the articles by publication date or by author name. 

 Learn more about how to set up categories here https://docs.pkp.sfu.ca/learning-ojs/en/journal-setup#categories