https://help.tallysolutions.com/docs/td9rel54/td9/working_with_projects/closing_projects.htm

Closing a Project

In Tally.Developer 9, you can close the current project or all open projects by going to the file options.

To close a project

Go to File > Close Active Project . Alternatively, right-click the project, and select Close .

Click Close All Projects to close a ll the open projects at once.