knigopis/app/src/main/res/menu/options.xml

<?xml version="1.0" encoding="utf-8"?>
<menu xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools">

    <item
        android:id="@+id/option_login"
        android:title="@string/main.option.login"
        android:visible="false"
        app:showAsAction="always"
        tools:ignore="AlwaysShowAction" />

    <item
        android:id="@+id/option_profile"
        android:title="@string/main.option.profile"
        android:visible="false"
        app:showAsAction="never" />

    <item
        android:id="@+id/option_sort_books"
        android:title="@string/main_option_sort">
        <menu>
            <group android:checkableBehavior="single">
                <item
                    android:id="@+id/option_sort_by_progress"
                    android:title="@string/main_option_sort_by_progress" />
                <item
                    android:id="@+id/option_sort_by_time"
                    android:title="@string/main_option_sort_by_time" />
                <item
                    android:id="@+id/option_sort_by_title"
                    android:title="@string/main_option_sort_by_title" />
                <item
                    android:id="@+id/option_sort_by_author"
                    android:title="@string/main_option_sort_by_author" />
            </group>
        </menu>
    </item>

    <item android:title="@string/main_option_theme">
        <menu>
            <group android:checkableBehavior="single">
                <item
                    android:id="@+id/option_light_theme"
                    android:title="@string/main_option_theme_light" />
                <item
                    android:id="@+id/option_dark_theme"
                    android:title="@string/main_option_theme_dark" />
                <item
                    android:id="@+id/option_default_theme"
                    android:title="@string/main_option_theme_default" />
            </group>
        </menu>
    </item>

    <item
        android:id="@+id/option_about"
        android:title="@string/main.option.about"
        app:showAsAction="never" />

    <item
        android:id="@+id/option_crash_report"
        android:checkable="true"
        android:title="@string/main.option.crash_report"
        app:showAsAction="never" />

    <!-- for debug only -->
    <item
        android:id="@+id/debug_option_clear_cache"
        android:icon="@drawable/debug_ic_broom"
        android:title="Clear cache"
        android:visible="false"
        app:showAsAction="always"
        tools:ignore="HardcodedText" />

    <!-- for debug only -->
    <item
        android:id="@+id/debug_option_toggle_theme"
        android:icon="@drawable/debug_ic_sunny"
        android:title="Toggle theme"
        android:visible="false"
        app:showAsAction="always"
        tools:ignore="HardcodedText" />

</menu>