The picture below shows a typical Home Page, here we look at section A as shown inside the dotted line.
The Google Assistant – Use the 
button on the remote control or the on-screen keyboard displayed on the television to input keywords and search for various content.
Notifications – Displayed when there are notifications such as when there is a connection issue or software update. The number within the circle indicates the number of notifications.
Network – Configure network and internet. This symbol changes depending on the connection type – Wi-Fi or Ethernet.
Settings – Configure various television related settings.