Clipp suggested this

src/main.rs

@@ -52,7 +52,7 @@ impl Default for RustDoomLauncher {
             launcher_manager: SingleManager::new(),
             iwad_manager: SingleManager::new(),
             pwad_manager: MultiManager::new(),
-            command_manager: CommandManager::new(),
+            command_manager: CommandManager::default(),
             add_name: "".to_string(),
             config_filename: default_save_filename(),
             config_file_loaded: false,
@@ -399,9 +399,8 @@ impl eframe::App for RustDoomLauncher {
                 });
         }
 
-        egui::Window::new("Add WAD or Launcher")
-            .open(&mut self.add_stuff_window_displayed)
-            .show(ctx, |ui| {
+        if self.add_stuff_window_displayed {
+            egui::Window::new("Add WAD or Launcher").show(ctx, |ui| {
                 ui.horizontal(|ui| {
                     let name_label = ui.label("Name");
                     ui.text_edit_singleline(&mut self.add_name)
@@ -478,5 +477,6 @@ impl eframe::App for RustDoomLauncher {
                     }
                 }
             });
+        }
     }
 }