WordPress ACF - Remove / override the choices for a radio, checkbox and select fields.

acf_filter_choice.php

<?php

/**
 * Removes custom style selector for non Administrator user roles.
 * Uses acf/load_field filter https://www.advancedcustomfields.com/resources/acf-load_field/
 *
 * @param array $field
 * @return array  
 */
function acf_filter_radio_choices( $field ) {
  
	// Check if current user has not administrator capabilities.
	if( !current_user_can( 'administrator' ) ) {
    
		// Unset the admin only choice/option, so it wont display for other user roles.
		unset( $field['choices']['the_removable_choice'] );
    
	}

   	// return the field back.
	return $field;
}
add_filter( 'acf/load_field/name=the_radio_btn_field_name', 'acf_filter_radio_choices' );