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/vendor/mediatek/proprietary/packages/apps/MtkSettings/res/xml/system_dashboard_fragment.xml

<PreferenceScreen
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:settings="http://schemas.android.com/apk/res-auto"
    android:key="system_dashboard_screen"
    android:title="@string/header_category_system"
    settings:initialExpandedChildrenCount="4">

意思是，超过4个菜单则折叠隐藏起来，否则没超过直接平铺展开显示！

@Override
    public void onCreate(Bundle icicle) {
        super.onCreate(icicle);

        final PreferenceScreen screen = getPreferenceScreen();
        // We do not want to display an advanced button if only one setting is hidden
        if (getVisiblePreferenceCount(screen) == screen.getInitialExpandedChildrenCount() + 1) {
            screen.setInitialExpandedChildrenCount(Integer.MAX_VALUE);
        }
    }