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I have the answer for question 2, I didn't put the use_checkbox at the right place! 😓

array(
  'type'  => 'categories',
  'label' => $this->l('Featured categories'),
  'name'  => 'FEATURED_CATEGORIES',
  'tree'  => array(
    'id' => 'category',
    'selected_categories' => array((int)Configuration::get('category')),
    'use_checkbox' => true
  )
),

But it still collapse by default and I still don't have any clues on how to save the selected_categories.

I have the answer for question 2, I didn't put the use_checkbox at the right place! 😓

array(
  'type'  => 'categories',
  'label' => $this->l('Featured categories'),
  'name'  => 'FEATURED_CATEGORIES',
  'tree'  => array(
    'id' => 'category',
    'selected_categories' => array((int)Configuration::get('category')),
    'use_checkbox' => true
  )
),

But it still collapse by default and saving button doesn't work. The getConfigFormValues is probably wrong as it might not be able to save multiple data? 🤔

I have the answer for question 2, I didn't put the use_checkbox at the right place! 😓

array(
  'type'  => 'categories',
  'label' => $this->l('Featured categories'),
  'name'  => 'FEATURED_CATEGORIES',
  'tree'  => array(
  'id' => 'category',
    'selected_categories' => array((int)Configuration::get('category')),
    'use_checkbox' => true
  )
),

But it still collapse by default and saving button doesn't work. The getConfigFormValues is probably wrong as it might not be able to save multiple data? 🤔