Index: src/bp-core/css/admin-bar-rtl.css
===================================================================
--- src/bp-core/css/admin-bar-rtl.css	(revision 11214)
+++ src/bp-core/css/admin-bar-rtl.css	(working copy)
@@ -56,3 +56,16 @@
 	height: 64px;
 	width: 64px;
 }
+
+/* Remove new arrows for wide screens introduced in WP 4.7.
+ * Add back arrows for screen widths 600px and lower.
+ */
+#wpadminbar .wp-admin-bar-arrow-right {
+	display: none;
+}
+
+@media screen and (max-width: 600px) {
+	#wpadminbar .wp-admin-bar-arrow-right {
+	display: block;
+	}
+}
Index: src/bp-core/css/admin-bar.css
===================================================================
--- src/bp-core/css/admin-bar.css	(revision 11214)
+++ src/bp-core/css/admin-bar.css	(working copy)
@@ -56,3 +56,16 @@
 	height: 64px;
 	width: 64px;
 }
+
+/* Remove new arrows for wide screens introduced in WP 4.7.
+ * Add back arrows for screen widths 600px and lower.
+ */
+#wpadminbar .wp-admin-bar-arrow-right {
+	display: none;
+}
+
+@media screen and (max-width: 600px) {
+	#wpadminbar .wp-admin-bar-arrow-right {
+	display: block;
+	}
+}