Indeed, the search was configured with something other than candidate1. I corrected my mistake.
I removed the “group” and I solved my problem in order to display the result by doing:
if ( results.items.length > 0 ){
let Items = results.items [ 0 ]. vueSum
}
let nomVues = results.items [ 0 ]. vueSum ;
$w ( '#inputShowVue' ). value = "" + nomVues ;
My problem is solved and thank you for your precious help.