diff --git a/docs/reference-guides/block-api/block-supports.md b/docs/reference-guides/block-api/block-supports.md
index 7fade99f4095d..7fd0e68c9bd8c 100644
--- a/docs/reference-guides/block-api/block-supports.md
+++ b/docs/reference-guides/block-api/block-supports.md
@@ -556,7 +556,7 @@ supports: {
     -   `allowVerticalAlignment`: type `boolean`, default value `true`
     -   `allowJustification`: type `boolean`, default value `true`
     -   `allowOrientation`: type `boolean`, default value `true`
-    -   `allowCustomContentSize`: type `boolean`, default value `true`
+    -   `allowCustomContentAndWideSize`: type `boolean`, default value `true`
 
 This value only applies to blocks that are containers for inner blocks. If set to `true` the layout type will be `flow`. For other layout types it's necessary to set the `type` explicitly inside the `default` object.
 
@@ -616,7 +616,7 @@ For the `flex` layout type, determines display of the justification control in t
 
 For the `flex` layout type only, determines display of the orientation control in the block toolbar.
 
-### layout.allowCustomContentSize
+### layout.allowCustomContentAndWideSize
 
 -   Type: `boolean`
 -   Default value: `true`
diff --git a/docs/reference-guides/theme-json-reference/theme-json-living.md b/docs/reference-guides/theme-json-reference/theme-json-living.md
index cf290d5505a46..24a5845381bfd 100644
--- a/docs/reference-guides/theme-json-reference/theme-json-living.md
+++ b/docs/reference-guides/theme-json-reference/theme-json-living.md
@@ -129,7 +129,7 @@ Settings related to layout.
 | contentSize | string |  |  |
 | wideSize | string |  |  |
 | allowEditing | boolean | true |  |
-| allowCustomContentSize | boolean | true |  |
+| allowCustomContentAndWideSize | boolean | true |  |
 
 ---
 
diff --git a/lib/class-wp-theme-json-gutenberg.php b/lib/class-wp-theme-json-gutenberg.php
index 192638f12abba..646c7abc59eaf 100644
--- a/lib/class-wp-theme-json-gutenberg.php
+++ b/lib/class-wp-theme-json-gutenberg.php
@@ -383,10 +383,10 @@ class WP_Theme_JSON_Gutenberg {
 			'minHeight' => null,
 		),
 		'layout'                        => array(
-			'contentSize'            => null,
-			'wideSize'               => null,
-			'allowEditing'           => null,
-			'allowCustomContentSize' => null,
+			'contentSize'                   => null,
+			'wideSize'                      => null,
+			'allowEditing'                  => null,
+			'allowCustomContentAndWideSize' => null,
 		),
 		'lightbox'                      => array(
 			'enabled'      => null,
diff --git a/packages/block-editor/src/layouts/constrained.js b/packages/block-editor/src/layouts/constrained.js
index 17983b2773c68..f86791391176f 100644
--- a/packages/block-editor/src/layouts/constrained.js
+++ b/packages/block-editor/src/layouts/constrained.js
@@ -36,8 +36,10 @@ export default {
 		layoutBlockSupport = {},
 	} ) {
 		const { wideSize, contentSize, justifyContent = 'center' } = layout;
-		const { allowJustification = true, allowCustomContentSize = true } =
-			layoutBlockSupport;
+		const {
+			allowJustification = true,
+			allowCustomContentAndWideSize = true,
+		} = layoutBlockSupport;
 		const onJustificationChange = ( value ) => {
 			onChange( {
 				...layout,
@@ -67,7 +69,7 @@ export default {
 		} );
 		return (
 			<>
-				{ allowCustomContentSize && (
+				{ allowCustomContentAndWideSize && (
 					<>
 						<div className="block-editor-hooks__layout-controls">
 							<div className="block-editor-hooks__layout-controls-unit">
diff --git a/schemas/json/theme.json b/schemas/json/theme.json
index 12a17ca80c688..782e59794a5d1 100644
--- a/schemas/json/theme.json
+++ b/schemas/json/theme.json
@@ -301,7 +301,7 @@
 							"type": "boolean",
 							"default": true
 						},
-						"allowCustomContentSize": {
+						"allowCustomContentAndWideSize": {
 							"description": "Enable or disable the custom content and wide size controls.",
 							"type": "boolean",
 							"default": true