Hide calendar Items on overview or layout pages?

It’s possible to hide Items on overview or layout pages?
I added a calendar in things and made items. If there is no current event in the calendar the items for current event are UNDEF. There is also a switch for current running events.
I tried to add Metadata for Standalone, List Item and Cell Widget and set the Visibility Options to

=items.calendar_currentevent.state === 'ON'

In the preview this element is hidden. But on the overview or layout page this item / widget is visible.
Hidding in Lists is working. But hidding a widget seems to be complicated.