@blove Are you using the RollCall attendance tool for your seating chart?  If that is the course, there isn't a way to have multiple sections display in the seating chart because of how RollCall pulls the enrollment information from Canvas.  What you could possibly do would be to create an additional section within the course that you enroll all of the students in.  Then you can create a seating chart for this additional course section.  You may need to contact the admin at your institution if you don't have the adequate permissions to create additional sections in your course (this permission varies from institution to institution many times).  You can refer to How do I add a section to a course as an instructor? for how to create this additional section in your course.