Yes, of course you can hide your last scene on WhatsApp Plus. If you want to freeze your last seen from your contacts, just follow these steps.

• Open your Whatsapp Plus APK
• Tap on the three dots in the top of its corner 
• Tap on “Account” to go to your account settings.
• Tap on “Privacy” (the first tab) to go to your privacy settings.
• Tap on the “Last Seen” tab to proceed to your “Last Seen” privacy settings.
• Tap on “Nobody” to freeze your “Last Seen” on WhatsApp plus .

But After hiding your last scene you also will be unable to see other's online status on your whatsapp. To see someone else's Last Seen time, your own must be accessible to your contacts. Double-check your own Last Seen settings at Settings > Privacy > Last Seen. The person may have blocked you. If you were seeing a person's Last Seen status before but can no longer see it, it's possible they've blocked you.