End of chapter 6. A lot of problems took to much time to solve. It was good to know better Godot internal mechanism.

scenes/ui/MessageLine.tscn

@@ -0,0 +1,11 @@
+[gd_scene load_steps=2 format=3 uid="uid://wbh5uji0cktb"]
+
+[ext_resource type="Theme" uid="uid://dnxny0n7ti7eq" path="res://themes/default_theme.tres" id="1_re2k6"]
+
+[node name="MessageLine" type="RichTextLabel"]
+theme = ExtResource("1_re2k6")
+text = "Enter Command: 
+
+"
+fit_content = true
+scroll_active = false