javascript - Leaflet set the ImageOverlay switched off at the initial stage

I would like to set my overlayimage off when reload the map.

According to the link:

https://stackoverflow.com/questions/46043995/set-leaflet-overlay-off-in-the-layer-control

I tried sth like this:

   var overlayMaps = (null,{

    "Geographic names": positronLabels,
    "City fibre": cityfibre
  });   

but there is no reaction on my map

In turn this example:

https://stackoverflow.com/questions/45333282/remove-leaflet-overlaymaps-layer-programmatically

Esri leaflet layers turned off by default in map layer control box

shows how to remove some layer instead of switch it off at the initial stage.

When I put null into my code, my overlay layers are gone:

    L.control.layers(baseMaps, null, overlayMaps).addTo(map);

I couldn't find a good solution on the Leaflet.js reference:

https://leafletjs.com/examples/layers-control/

Is there any option to make them switched off at the initial stages?