Add single lesson template in theme.json

course/theme.json

@@ -82,6 +82,13 @@
 				"post",
 				"course"
 			]
+		},
+		{
+			"name": "single-lesson",
+			"title": "Single Lesson",
+			"postTypes": [
+				"lesson"
+			]
 		}
 	],
 	"settings": {