Disable scrolling ability ?

In tried this (on the page)

//selects the 'categorie' input
export function categorieInput_change(event, $w) {
	let filter = wixData.filter();
	//shows loading screen while loading data
		 wixWindow.openLightbox("Loader");
	if ($w("#checkbox1").checked)
 	{
    	filter=filter.ne("dispo", true);
	}
	filter = filter
		.contains("title", $w("#searchInput").value)
		.contains("categorie", $w("#categorieInput").value)
		.contains("vendeur", $w("#vendeurInput").value)
		.contains("type", $w("#typeRadio").value);
		$w("#dynamicDataset").onReady( () => {   
	$w("#dynamicDataset").setFilter(filter)
	//hides loading screen after data was retrieved
	 .then( () => {       
            wixWindow.lightbox.close("Loader");
     });
}
);
}

even this (on the lightbox code panel)

$w("#dynamicDataset").onReady( () => {   
  
  .then( () => {        
    
wixWindow.lightbox.close("Loader");
} );
}

but no dice