Minor edits to niri.

.config/DankMaterialShell/settings.json

@@ -141,7 +141,7 @@
   "appLauncherViewMode": "grid",
   "spotlightModalViewMode": "grid",
   "sortAppsAlphabetically": false,
-  "appLauncherGridColumns": 5,
+  "appLauncherGridColumns": 6,
   "spotlightCloseNiriOverview": true,
   "niriOverviewOverlayEnabled": true,
   "useAutoLocation": false,

.config/niri/config.kdl

@@ -169,6 +169,11 @@ animations {
 }
 
 // Window rules let you adjust behavior for individual windows.
+window-rule {
+    match title="VirtualBox"
+    open-fullscreen true
+}
+
 window-rule {
     // This app-id regular expression will work for both:
     // - host Firefox (app-id is "firefox")