diff --git a/src/js/_enqueues/wp/theme.js b/src/js/_enqueues/wp/theme.js
index e4bebbbc1e8c1..65b5b4cf1c63d 100644
--- a/src/js/_enqueues/wp/theme.js
+++ b/src/js/_enqueues/wp/theme.js
@@ -96,7 +96,7 @@ themes.view.Appearance = wp.Backbone.View.extend({
 	},
 
 	// Defines search element container.
-	searchContainer: $( '.search-form' ),
+	searchContainer: $( '.search-form .search-box' ),
 
 	// Search input and view
 	// for current theme collection.
@@ -118,7 +118,7 @@ themes.view.Appearance = wp.Backbone.View.extend({
 		// Render and append after screen title.
 		view.render();
 		this.searchContainer
-			.append( $.parseHTML( '<label class="screen-reader-text" for="wp-filter-search-input">' + l10n.search + '</label>' ) )
+			.append( $.parseHTML( '<label for="wp-filter-search-input">' + l10n.search + '</label>' ) )
 			.append( view.el )
 			.on( 'submit', function( event ) {
 				event.preventDefault();
@@ -1359,7 +1359,6 @@ themes.view.Search = wp.Backbone.View.extend({
 	searching: false,
 
 	attributes: {
-		placeholder: l10n.searchPlaceholder,
 		type: 'search',
 		'aria-describedby': 'live-search-desc'
 	},
diff --git a/src/wp-admin/css/themes.css b/src/wp-admin/css/themes.css
index a68abbca04f94..e7c58b257fc76 100644
--- a/src/wp-admin/css/themes.css
+++ b/src/wp-admin/css/themes.css
@@ -19,23 +19,23 @@ body.js .theme-browser.search-loading {
 	clear: both;
 }
 
-.themes-php:not(.network-admin) .wrap h1 {
-	margin-bottom: 15px;
-}
-
 .themes-php .wrap h1 .button {
 	margin-left: 20px;
 }
 
 /* Search form */
 .themes-php .search-form {
-	display: inline;
+	display: inline-flex;
+	align-items: center;
+	position: relative;
+	top: 0;
+	gap: .5rem;
+	width: 100%;
+	justify-content: end;
 }
 
 .themes-php .wp-filter-search {
 	position: relative;
-	top: -2px;
-	left: 20px;
 	margin: 0;
 	width: 280px;
 }
@@ -955,11 +955,15 @@ body.folded .theme-browser ~ .theme-overlay .theme-wrap {
 		clear: both;
 		left: 0;
 		right: 0;
-		margin: -5px 0 20px;
 		width: 100%;
 		max-width: 280px;
 	}
 
+	.theme-install-php .wp-filter p.search-box {
+		display: grid;
+		row-gap: .5rem;
+	}
+
 	.theme-browser .theme.add-new-theme span:after {
 		font: normal 60px/90px dashicons;
 		width: 80px;
@@ -1029,6 +1033,13 @@ body.folded .theme-browser ~ .theme-overlay .theme-wrap {
 	padding-left: 20px;
 }
 
+/* Override column gap adjustment in media library. */
+@media only screen and (max-width: 1000px) {
+	.theme-install-php .wp-filter p.search-box {
+		column-gap: .5rem;
+	}
+}
+
 .theme-install-php a.upload,
 .theme-install-php a.browse-themes {
 	cursor: pointer;
diff --git a/src/wp-admin/network/site-themes.php b/src/wp-admin/network/site-themes.php
index 79fe4d5f0576b..8d76efc259333 100644
--- a/src/wp-admin/network/site-themes.php
+++ b/src/wp-admin/network/site-themes.php
@@ -237,7 +237,7 @@
 <p><?php _e( 'Network enabled themes are not shown on this screen.' ); ?></p>
 
 <form method="get">
-<?php $wp_list_table->search_box( __( 'Search Installed Themes' ), 'theme' ); ?>
+<?php $wp_list_table->search_box( __( 'Search installed themes' ), 'theme' ); ?>
 <input type="hidden" name="id" value="<?php echo esc_attr( $id ); ?>" />
 </form>
 
diff --git a/src/wp-admin/network/themes.php b/src/wp-admin/network/themes.php
index 4c6febea9805f..7252fa744fc78 100644
--- a/src/wp-admin/network/themes.php
+++ b/src/wp-admin/network/themes.php
@@ -460,7 +460,7 @@
 ?>
 
 <form method="get">
-<?php $wp_list_table->search_box( __( 'Search Installed Themes' ), 'theme' ); ?>
+<?php $wp_list_table->search_box( __( 'Search installed themes' ), 'theme' ); ?>
 </form>
 
 <?php
diff --git a/src/wp-admin/theme-install.php b/src/wp-admin/theme-install.php
index 293d9a0ccae0b..1cebf3405f117 100644
--- a/src/wp-admin/theme-install.php
+++ b/src/wp-admin/theme-install.php
@@ -56,7 +56,6 @@
 		'l10n'            => array(
 			'addNew'              => __( 'Add New Theme' ),
 			'search'              => __( 'Search Themes' ),
-			'searchPlaceholder'   => __( 'Search themes...' ), // Placeholder (no ellipsis).
 			'upload'              => __( 'Upload Theme' ),
 			'back'                => __( 'Back' ),
 			'error'               => sprintf(
@@ -217,7 +216,7 @@
 
 		<button type="button" class="button drawer-toggle" aria-expanded="false"><?php _e( 'Feature Filter' ); ?></button>
 
-		<form class="search-form"></form>
+		<form class="search-form"><p class="search-box"></p></form>
 
 		<div class="favorites-form">
 			<?php
diff --git a/src/wp-admin/themes.php b/src/wp-admin/themes.php
index 4db4c5066cad0..d74708200fc9b 100644
--- a/src/wp-admin/themes.php
+++ b/src/wp-admin/themes.php
@@ -232,8 +232,7 @@
 		),
 		'l10n'     => array(
 			'addNew'            => __( 'Add New Theme' ),
-			'search'            => __( 'Search Installed Themes' ),
-			'searchPlaceholder' => __( 'Search installed themes...' ), // Placeholder (no ellipsis).
+			'search'            => __( 'Search installed themes' ),
 			/* translators: %d: Number of themes. */
 			'themesFound'       => __( 'Number of Themes found: %d' ),
 			'noThemesFound'     => __( 'No themes found. Try a different search.' ),
@@ -252,14 +251,12 @@
 	<h1 class="wp-heading-inline"><?php esc_html_e( 'Themes' ); ?>
 		<span class="title-count theme-count"><?php echo ! empty( $_GET['search'] ) ? __( '&hellip;' ) : count( $themes ); ?></span>
 	</h1>
-
 	<?php if ( ! is_multisite() && current_user_can( 'install_themes' ) ) : ?>
 		<a href="<?php echo esc_url( admin_url( 'theme-install.php' ) ); ?>" class="hide-if-no-js page-title-action"><?php echo esc_html__( 'Add New Theme' ); ?></a>
 	<?php endif; ?>
-
-	<form class="search-form"></form>
-
 	<hr class="wp-header-end">
+	<form class="search-form search-themes"><p class="search-box"></p></form>
+
 <?php
 if ( ! validate_current_theme() || isset( $_GET['broken'] ) ) {
 	wp_admin_notice(