Somewhat better hierarchy.

Init separate .qml files.

imports/Spectral/Page/SettingCategoryDelegate.qml

@@ -0,0 +1,11 @@
+import QtQuick 2.9
+import QtQuick.Controls 2.2
+
+ItemDelegate {
+    text: category
+
+    onClicked: {
+        settingStackView.clear()
+        settingStackView.push([accountForm, generalForm, appearanceForm, aboutForm][form])
+    }
+}