Merge pull request #3973 from Automattic/fix/nav-font-size

update font size to 18px

blockbase/theme.json

@@ -312,7 +312,7 @@
 			},
 			"core/navigation": {
 				"typography": {
-					"fontSize": "var(--wp--preset--font-size--small)"
+					"fontSize": "var(--wp--preset--font-size--normal)"
 				}
 			},
 			"core/navigation-link": {