Once you are done with network configuration, you need to run nmtui-connect to enable/disable network interface based on your need.

# nmtui-connect

In order to verify the network configuration settings, you can check the content of the interface file or you can issue the below commands.

# ifconfig ens3
# ip a
# ping -c2 google.com

You can also use other useful network utilities such as ethtool and mii-tool to check the speed of network interface, and etc.

# ethtool ens3
# mii-tool ens3