The base Context.sublime-menu
file is stored in the Default
package, which is stored as a sublime-package
file and isn’t visible in the Packages
or Installed Packages
directory because it ships with Sublime text. Modifying or overriding that file will alter the menu contents, while putting a similarly named file in any other Package
directory will augment it instead.
To actually change the default, you can use PackageResourceViewer; select Package Resource Viewer: Open Resource
from the command palette, then select the Default
package and the Context.sublime-menu
file. This will open up the packaged file for you, and when you save
will automatically create a package override for the file.
From this point forward sublime will ignore the shipped version of the file and use your version as the base instead; other packages can still augment the menu as desired.
Note that you won’t get warned by Sublime if a future update makes modifications to the default context menu. Your override will be used unconditionally. In order to ensure that you get warned of potential future changes to the file you’re overriding, you can use OverrideAudit, which will warn you if the shipped file becomes newer than your override.