This is used to edit the options for the Snippet Window, and for snippets in general. See: Code Snippets.
List Columns
Select the columns you want to include in the Snippet Window.
List Contents
Select the type of snippets you want to include in the Snippet Window.
Snippet Options
Confirm when deleting snippets
Select this to be prompted before deleting any snippets in the Snippet Window.
Propose snippets in auto-completion as you type
Select this to include snippets in the auto-completion list as you type in the editor. If you disable this option, you can explicitly complete snippets using the Complete Snippets command (Ctrl+E)
Note you can also set this option on a per-snippet basis in the Snippet Properties window. See: Snippet Properties.
Enable text variables when inserting snippet
Select this to enable text variables to be automatically replaced with their values when you insert snippets. Note you can also set this option on a per-snippet basis in the Snippet Properties window. See: Snippet Properties.