Layout tweaks. Changed new page classes to kebab case to avoid future stylelint selector warnings. Styling notices when they appear above the purple header.

assets/css/admin.scss

@@ -560,7 +560,7 @@
 		width: 100%;
 	}
 
-.products {
+	.products {
 		display: flex;
 		flex-flow: row;
 		flex-wrap: wrap;
@@ -685,6 +685,33 @@
 	max-width: 1200px;
 }
 
+.woocommerce-page-wc-marketplace {
+
+	.woocommerce-layout {
+		display: none;
+	}
+
+	#wpbody {
+
+		.notice {
+			margin-left: 20px;
+			margin-right: 20px;
+		}
+
+		.notice:first-of-type {
+			margin: 42px 20px 15px;
+		}
+	}
+}
+
+.woocommerce-embed-page.woocommerce-page-wc-marketplace {
+
+	#screen-meta-links {
+		position: absolute;
+		right: 0;
+	}
+}
+
 .woocommerce-message,
 .woocommerce-BlankState {
 	a.button-primary,
@@ -2764,6 +2791,16 @@ ul.wc_coupon_list_block {
 			margin-top: 4px;
 		}
 	}
+
+	.woocommerce-page-wc-marketplace {
+
+		#wpbody {
+
+			.notice:first-of-type {
+				margin-top: 52px;
+			}
+		}
+	}
 }
 
 .column-customer_message .note-on {
@@ -7338,15 +7375,6 @@ table.bar_chart {
 	font-weight: bold;
 }
 
-/* stylelint-disable selector-class-pattern */
-.woocommerce-embed-page.woocommerce_page_wc-addons {
-
-	#screen-meta-links {
-		position: absolute;
-		right: 0;
-	}
-}
-
 @media screen and (min-width: 600px) {
 
 	.wc-addons-wrap {

includes/admin/class-wc-admin-addons.php

@@ -805,9 +805,9 @@ class WC_Admin_Addons {
 	 */
 	public static function filter_admin_body_classes( string $admin_body_class = '' ) {
 		if ( isset( $_GET['section'] ) && 'helper' === $_GET['section'] ) {
-			return " $admin_body_class woocommerce_page_wc-subscriptions ";
+			return " $admin_body_class woocommerce-page-wc-subscriptions ";
 		}
 
-		return " $admin_body_class woocommerce_page_wc-marketplace ";
+		return " $admin_body_class woocommerce-page-wc-marketplace ";
 	}
 }