Prevents users from accidentally deleting folders selected in the navigator.
There is no UI equivalent for DisableDelKeyForNavigator.
If DisableDelKeyForNavigator is absent or set to 0, folders selected in the navigation pane can be deleted.
Add DisableDelKeyForNavigator=1 to NOTES.INI. The simplest way to accomplish this is via a Desktop Settings document in an (Organizational) Policy document.
This configuration is valid for Notes and Domino 9.0 Social Edition and beyond.