WhatsApp privacy settings: last seen, online, read receipts
This tutorial will show you step by step how to hide your “last seen” and “online” statuses and disable read receipts (blue ticks) on WhatsApp on Android.
Contents:
The steps on this page work for all Android phones, such as Samsung, Google, OnePlus, Motorola, Xiaomi, Nokia, Oppo, and all other Android phones.
How to hide your “last seen” and “online” statuses on WhatsApp
The “last seen” and “online” statuses tell you the last time your contacts used WhatsApp, or if they're online.
Steps
1. Open WhatsApp.
2. Tap on the ⁝ menu icon located in the top right corner.

3. Tap on Settings.

4. Tap on Privacy.

5. Tap on Last seen and online.

6. Under “Who can see my last seen”, you select Nobody.

Your “last seen” status is now hidden.
7. Under “Who can see when I'm online”, you select Same as last seen.

Your “online” status is now hidden as well.
How to disable read receipts (blue ticks) on WhatsApp
Check marks will appear next to each message you send. The double blue check marks mean that the recipient has read your message.
Steps
1. Open WhatsApp.
2. Tap on the ⁝ menu icon located in the top right corner.

3. Tap on Settings.

4. Tap on Privacy.

5. Tap on the toggle button next to Read receipts to turn it off.

The read receipts (blue ticks) are now disabled.
Related:
How to prevent your WhatsApp account from being hacked
How to block someone on WhatsApp without opening their message
How to silence calls from unknown numbers on WhatsApp
How to disable “WhatsApp Web is currently active” notification
How to change a WhatsApp chat background on an Android phone
How to hide your last seen and online status on WhatsApp Web
References:
https://faq.whatsapp.com/3307102709559968/
https://faq.whatsapp.com/665923838265756/?cms_platform=android