init

kirby/config/fields/mixins/layout.php

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+<?php
+
+return [
+	'props' => [
+		/**
+		 * Changes the layout of the selected entries.
+		 * Available layouts: `list`, `cardlets`, `cards`
+		 */
+		'layout' => function (string $layout = 'list') {
+			$layouts = ['list', 'cardlets', 'cards'];
+			return in_array($layout, $layouts) ? $layout : 'list';
+		},
+
+		/**
+		 * Layout size for cards: `tiny`, `small`, `medium`, `large`, `huge`, `full`
+		 */
+		'size' => function (string $size = 'auto') {
+			return $size;
+		},
+	]
+];