Closes all files in the current project except the one you’re currently viewing. If a file has unsaved modifications then by default EditPad asks you whether you want to save or discard the changes. If multiple files have unsaved changes then you get one prompt for each file. The prompt then has buttons to save all files or to discard changes to all files. If you click Cancel Close at any point then no files are closed. Choosing to save a file saves it immediately. On the Open Files page in the Preferences you can choose if EditPad should automatically save or discard unsaved changes without prompting.
If you want to close all files in all projects, except the current file, first use Project|Close All but Current to close all other projects. Then use File|Close All but Current to close all other files in the current project.
Project|Close All but Current