Quill offers a variety of grammar topics as well as themed lessons. If you are looking for a specific topic, you can find it by going to the "Assign Activities" tab. From there, click "Explore activities", then "Choose activities from our library", and "Create your own activity pack".
That will bring you to our comprehensive list of Quill activities. Once here, you can use the search tool to look for a specific topic. You can search for grammar topics or themed activities (e.g. "Gandhi"). You also have the option to filter the search by category or CCSS standard.