Accepting more than one appointment per time slot with Appointments+

I am looking to be allowed to have 6 appointments per time slot. There are 2 service providers that I have and each one has the same service. I have looked at the previous forum help with the same issue and added these to my functions file

// Added to Appointment Capacity

function increase_capacity( $capacity, $service_id, $worker_id ) {
    return 6;
add_filter( 'app_get_capacity', 'increase_capacity', 10, 3 );

I can only add 1 appointment per time slot still. I have granted your support staff access right now, so you can see what we have going. It is for the page:

We are also looking to only show the Month of October right now for users to select from. Is there a shortcode for that?