Fieldset allow user to group elements and display them in columns.
array(
'type' => 'fieldset',
'id' => 'fieldset_1',
'title' => esc_html__( 'Fieldset field', 'plugin-name' ),
'description' => esc_html__( 'Cols can be 1, 2, 3 to 4 and 6.', 'plugin-name' ),
'options' => array(
'cols' => 3,
),
'fields' => array(
// other fields...
),
),