diff --git a/plugins/woocommerce-admin/client/marketplace/components/content/content.scss b/plugins/woocommerce-admin/client/marketplace/components/content/content.scss
index f6277377eb8..5303f22b12d 100644
--- a/plugins/woocommerce-admin/client/marketplace/components/content/content.scss
+++ b/plugins/woocommerce-admin/client/marketplace/components/content/content.scss
@@ -8,8 +8,18 @@
 	min-height: 500px;
 }
 
+.woocommerce-marketplace__content .woocommerce-customize-store-banner .woocommerce-customize-store-banner-content {
+	width: 100%;
+}
+
 @media screen and (min-width: $breakpoint-medium) {
 	.woocommerce-marketplace__content {
 		padding: $grid-unit-60 $grid-unit-40;
 	}
 }
+
+@media screen and (max-width: $breakpoint-medium) {
+	.woocommerce-marketplace__content .woocommerce-customize-store-banner .woocommerce-customize-store-banner-content {
+		margin-top: 40px;
+	}
+}
diff --git a/plugins/woocommerce-admin/client/marketplace/components/header/header.scss b/plugins/woocommerce-admin/client/marketplace/components/header/header.scss
index d26281083a2..11616f62a7f 100644
--- a/plugins/woocommerce-admin/client/marketplace/components/header/header.scss
+++ b/plugins/woocommerce-admin/client/marketplace/components/header/header.scss
@@ -9,6 +9,9 @@
 		"mktpl-tabs mktpl-tabs mktpl-tabs" auto / 1fr 320px 36px;
 	padding: 0 $content-spacing-large;
 	width: 100%;
+	position: sticky;
+	top: var(--wp-admin--admin-bar--height, 32px);
+	z-index: 1;
 
 	/* On narrow screens, "stack" header items and hide the bottom border */
 	@media (width <= $breakpoint-medium) {
diff --git a/plugins/woocommerce-admin/client/marketplace/marketplace.scss b/plugins/woocommerce-admin/client/marketplace/marketplace.scss
index 5a0813ae16d..913eb917ed1 100644
--- a/plugins/woocommerce-admin/client/marketplace/marketplace.scss
+++ b/plugins/woocommerce-admin/client/marketplace/marketplace.scss
@@ -7,11 +7,6 @@
 		margin: 0;
 	}
 
-	#wpbody-content {
-		/* Prevent double-scrollbar issue on WooCommerce > Extension pages */
-		overflow: hidden;
-	}
-
 	.woocommerce-layout__primary {
 		margin: 0;
 	}
diff --git a/plugins/woocommerce/changelog/51187-update-21566-in-app-marketaplace-header-sticky b/plugins/woocommerce/changelog/51187-update-21566-in-app-marketaplace-header-sticky
new file mode 100644
index 00000000000..844123a8234
--- /dev/null
+++ b/plugins/woocommerce/changelog/51187-update-21566-in-app-marketaplace-header-sticky
@@ -0,0 +1,4 @@
+Significance: patch
+Type: update
+
+Make In-App Marketplace header sticky to improve discoverability.
\ No newline at end of file