Within the CP, how can I filter the listed Entries based on a Lightswitch field value? I tried these kind of searches in the CP search field (on top of the Entry list):

fieldHandle:true / fieldHandle:false
fieldHandle:1 / fieldHandle:0
fieldHandle:* / -fieldHandle:*
fieldHandle:not 1 / fieldHandle:'not 1'
etc.

Unfortunately, none of these returns the expected entries.
Lightswitch fields are a bit of an edge-case in searching because it can only be true/false (in the real boolean sense of true/false) so Craft doesn't explicitly index it in the searchindex table.
That's a bit awkward because even through there is a field setting &quot;use this field's value for the search index&quot; it's the one field where it doesn't apply.
Regardless, this should all be rectified for the upcoming Craft 4 release where we plan to make this possible.