diff --git a/packages/block-library/src/navigation/block.json b/packages/block-library/src/navigation/block.json
index 6b64fe9566291d..63ded62fca6933 100644
--- a/packages/block-library/src/navigation/block.json
+++ b/packages/block-library/src/navigation/block.json
@@ -55,7 +55,7 @@
 		"orientation": "orientation"
 	},
 	"supports": {
-		"align": [ "wide", "full" ],
+		"align": true,
 		"anchor": true,
 		"html": false,
 		"inserter": true,
diff --git a/packages/block-library/src/navigation/editor.scss b/packages/block-library/src/navigation/editor.scss
index 427595912acf7a..463e64581b5027 100644
--- a/packages/block-library/src/navigation/editor.scss
+++ b/packages/block-library/src/navigation/editor.scss
@@ -18,6 +18,12 @@
 	display: inline-block;
 }
 
+// Properly center-align the block.
+.wp-block[data-align="center"] > .wp-block-navigation {
+	display: table;
+	margin-left: auto;
+	margin-right: auto;
+}
 
 /**
  * Submenus.
@@ -55,6 +61,26 @@
 	}
 }
 
+// When aligned right, open all submenus leftwards.
+// This needs high specificity.
+.wp-block[data-align="right"] > .wp-block-navigation .wp-block-page-list > .has-child,
+.wp-block[data-align="right"] > .wp-block-navigation > .wp-block-navigation__container .has-child {
+
+	// First submenu.
+	.submenu-container,
+	.wp-block-navigation-link__container {
+		left: auto;
+		right: 0;
+
+		// Nested submenus.
+		.submenu-container,
+		.wp-block-navigation-link__container {
+			left: auto;
+			right: 100%;
+		}
+	}
+}
+
 // Show a submenu when generally dragging (is-dragging-components-draggable) if that
 // submenu has children (has-child) and is being dragged within (is-dragging-within).
 .is-dragging-components-draggable .has-child.is-dragging-within {
diff --git a/packages/block-library/src/navigation/style.scss b/packages/block-library/src/navigation/style.scss
index 4a5ae3b06c55c6..fd6f3524c9a372 100644
--- a/packages/block-library/src/navigation/style.scss
+++ b/packages/block-library/src/navigation/style.scss
@@ -76,6 +76,13 @@
 			stroke: currentColor;
 		}
 	}
+
+	// Properly center-align the block.
+	&.aligncenter {
+		display: table;
+		margin-left: auto;
+		margin-right: auto;
+	}
 }
 
 
@@ -274,11 +281,14 @@
 
 // When justified space-between, open submenus leftward for last menu item.
 // When justified right, open all submenus leftwards.
+// When aligned right, open all submenus leftwards.
 // This needs high specificity.
 .wp-block-navigation.items-justified-space-between .wp-block-page-list > .has-child:last-child,
 .wp-block-navigation.items-justified-space-between > .wp-block-navigation__container > .has-child:last-child,
 .wp-block-navigation.items-justified-right .wp-block-page-list > .has-child,
-.wp-block-navigation.items-justified-right > .wp-block-navigation__container .has-child {
+.wp-block-navigation.items-justified-right > .wp-block-navigation__container .has-child,
+.wp-block-navigation.alignright .wp-block-page-list > .has-child,
+.wp-block-navigation.alignright > .wp-block-navigation__container .has-child {
 
 	// First submenu.
 	.submenu-container,
diff --git a/packages/block-library/src/site-title/block.json b/packages/block-library/src/site-title/block.json
index 1d148ac303a190..eb959a59ac2ae1 100644
--- a/packages/block-library/src/site-title/block.json
+++ b/packages/block-library/src/site-title/block.json
@@ -15,7 +15,7 @@
 		}
 	},
 	"supports": {
-		"align": [ "wide", "full" ],
+		"align": true,
 		"html": false,
 		"color": {
 			"gradients": true,
diff --git a/packages/block-library/src/site-title/editor.scss b/packages/block-library/src/site-title/editor.scss
index 372a85db2f4b13..ea9990bb048afc 100644
--- a/packages/block-library/src/site-title/editor.scss
+++ b/packages/block-library/src/site-title/editor.scss
@@ -1,3 +1,10 @@
+// Properly center-align the block.
+.wp-block[data-align="center"] > .wp-block-site-title {
+	display: table;
+	margin-left: auto;
+	margin-right: auto;
+}
+
 .wp-block-site-title__placeholder {
 	padding: 1em 0;
 	border: 1px dashed;
diff --git a/packages/block-library/src/site-title/style.scss b/packages/block-library/src/site-title/style.scss
new file mode 100644
index 00000000000000..4ded105294b164
--- /dev/null
+++ b/packages/block-library/src/site-title/style.scss
@@ -0,0 +1,6 @@
+// Properly center-align the block.
+.wp-block-site-title.aligncenter {
+	display: table;
+	margin-left: auto;
+	margin-right: auto;
+}
diff --git a/packages/block-library/src/style.scss b/packages/block-library/src/style.scss
index 92e10a3dee23a6..425c7d7a0be160 100644
--- a/packages/block-library/src/style.scss
+++ b/packages/block-library/src/style.scss
@@ -41,6 +41,7 @@
 @import "./search/style.scss";
 @import "./separator/style.scss";
 @import "./site-logo/style.scss";
+@import "./site-title/style.scss";
 @import "./social-links/style.scss";
 @import "./spacer/style.scss";
 @import "./tag-cloud/style.scss";