android, how to back to the app when backpress from the deeplink opened activity

Question

Having a android app which has mainActivity, and other activities, say it has a settingsActivity.

The app has deeplink setup to open the settingsActivity.

<activity android:name=".SettingsActivity"
            android:launchMode="singleTop">
            <intent-filter >
                <action android:name="android.intent.action.VIEW" />
                <category android:name="android.intent.category.DEFAULT" />
                <data
                    android:scheme="settingsscheme"
                    android:host="www.settings.com"
                    android:pathPrefix="/settingspath" />
            </intent-filter>
        </activity>

when a deeplink url settingsscheme://www.settings.com/settingspath?id=eee888\ is encountered the SettingsActivity will be open.

But when the app is killed, when this deeplink url causes SettingsActivity open, and then back press, the SettingsActivity will be closed but not back to the mainActivity of the app.

In the case of the app is killed, and backpress from an app's sub activity, how to bring up the mainActivity of the app?