Source: https://missionpinball.org/latest/config/widget_player/ (archived 2026-10-09; the part cited).
Single value, type: string. Defaults to empty.
The name of the slide you want to add this widget to. If this is not specified, then the widget
will be added to whichever slide is currently active on the default display.
(Mutually exclusive with target:, which takes priority if both are used.)