This seems lightly bugged, it’s now default enabled on every page refresh on my PC now, and it’s throwing a few depreciations:
[THEME 105 'Plugin Outlet Locations'] Deprecation notice: The header-icons widget has been deprecated and decorateWidget is no longer a supported override. [deprecated since Discourse v3.3.0.beta1-dev] [deprecation id: discourse.header-widget-overrides] [info: https://meta.discourse.org/t/296544]
[THEME 105 'Plugin Outlet Locations'] Deprecation notice: The header-icons widget has been deprecated and attachWidgetAction is no longer a supported override. [deprecated since Discourse v3.3.0.beta1-dev] [deprecation id: discourse.header-widget-overrides] [info: https://meta.discourse.org/t/296544]