'How to close document and switch to default activity or launch it if not started?

I have a notification that should open activity and the user can accept or reject notification content as the user could receive multiple notifications, I'm opening every activity in document, this is how I open activity in document

    val intent = Intent().setClassName(
        applicationContext.packageName,
        "activityclassname"
    )
    intent.putExtra(PendingRequestFCM::class.java.simpleName,requestFCM)
    intent.flags = Intent.FLAG_ACTIVITY_NEW_DOCUMENT
    val pendingIntent = PendingIntent.getActivity(this, 0, intent, 0)
    return pendingIntent

this opens the activity but the problem is when the user take action I need to bring home activity to the top or open it if it's not open but every time I open it, it starts in the current document, making the user have 2 documents opened( 2 instances of the app in recent apps), so how to close the current document and open activity in default document?

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'How to close document and switch to default activity or launch it if not started?

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