To enable the "Restrict Group" feature in WhatsApp, you can follow these general steps:
Open WhatsApp on your mobile device.
Go to the group chat that you want to apply the restrictions to.
Tap on the group name at the top to access the Group Info page.
From the Group Info page, tap on "Group Settings" or a similar option.
Look for the "Restrict Group" option and tap on it to enable the feature.
Please note that the availability and exact steps to enable the "Restrict Group" feature may vary depending on the version of you are using. It's recommended to consult the official WhatsApp documentation or support channels for the most accurate and up-to-date instructions specific to your version of the app.