Setting name	Description
Allow Image Sizes	Filter which image size can be chosen
Appearance	Select the appearance of this field
Default Value	Enter each default value on a new line
Display Format	Choose between Size name, size or size name and dimensions
Return Value	Return the size object or size name
Allow Null	Allow empty value
Layout	Choose the layout
Toggle	Allow to toggle all values
Allow Custom	Allow custom value
Save Custom	Save custom value in the field settings
Select multiple values	Allow multiple values selection
Stylised UI	Enable Select2 UI style

#Field Value

#Return Format: Size Object

$image_sizes = get_field('image_sizes');

/**
 * array(
 *     'name'   => 'thumbnail',
 *     'width'  => 150,
 *     'height' => 150,
 *     'crop'   => true,
 * )
 */

#Return Format: Size Name

$image_sizes = get_field('image_sizes');

// thumbnail

#Unformatted Value

$image_sizes = get_field('image_sizes', false, false);

// thumbnail