No "Forget this network" option what now?

If the following description does not clear this, and if you are not on a supervised device, then check with Apple Support:

How to forget a Wi-Fi network on your iPhone, iPad, iPod touch, or Mac - Apple Support

"Forget This Network" only appears if you have previously connected to that WiFi network. It tells your iPhone to stop automatically connecting to it when it is in range.

If you are asking how to make a particularly WiFi network never show up in your network list, you can only do so by physically moving away from the location where that network is available.

JillyBean6543 Said:

"No 'Forget this network' option what now?: How do I delete a network from my iPhone 13 when there is no 'forget this Network' option?"

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About Forget this Network:

Visited this Link?: How to Forget a Wi-Fi Network on your iPhone, iPad, iPod touch, or Mac - Apple Support

Are you using a device with a mobile device management configuration profile loaded?

Settings > General > VPN & Device Management

If so, you'll either need to remove the associated profile, or check with the IT organization that loaded the profile.