The Persistent Menu brings users directly into the top-level features and flows in your bot. It shows at the bottom of the screen so people can quickly access those buttons.
The persistent menu can have up to 3 individual buttons. Each item can:
Open url
Send message
How to setup the persistent menu
1) In the side navigation, click the persistent menu option under "Settings":
2) Tick the the "Menu enabled" section in order to enable your persistent menu. You will then be able to add in your menu items and link them to a message or URL.
3) Once you've set up the persistent menu, for it to start appearing in chat on desktop you need to refresh the page.
Disabling text input
From the persistent menu screen you can also disable text input completely.