Calculate the remaining entries when the max submission limit is set and the value can be displayed in front end.

Remaining Entries in Fluent Forms using smart shortcodes

/* Snippet: A smart shortcodes will be generated that can be added to any field on the form and it will be displayed in front-end */

add_filter('fluentform_editor_shortcodes', function ($smartCodes) {
    $smartCodes[0]['shortcodes']['{remaining_entries}'] = 'Remaining Entries';
    return $smartCodes;
});

add_filter('fluentform_editor_shortcode_callback_remaining_entries', function ($value, $form) {
	
	$max_entries = $form->settings['restrictions']['limitNumberOfEntries']['numberOfEntries'];
   
  	$current_entries = wpFluent()->table('fluentform_submissions')
        ->where('form_id', $form->id)
        ->get();
	
	$available_entries = $max_entries - count($current_entries);
	
        return $available_entries;
}, 10, 2);