From the knowledge base:

macOS 11 Big Sur

After thorough testing on macOS 11 Big Sur, we have determined that Finale v26.3.1 is compatible with this OS. We are not aware of any major issues that prevent the program from operating as expected. There are, however, a few minor cosmetic issues that are present and we will continue to work with Apple to address these. For more information on these, visit the articles linked below.