For that, you have to talk to BotFather.
In the Telegram App, open the chat with BotFather.
Send him /setcommands
. He will present you with a list of your bots.
Pick the bot for which you want to set the command menu.
Compose and send the command list. Using your image as an example, these 4 lines should do:
start - Description 1
menu - Description 2
help - Description 3
stop - Description 4
Note that each line should start with lowercase, and no slashes. There should also be spaces around the -
sign.
Once you complete this process, exit and kill the Telegram App. Re-open it, go to the chat with your target bot, type a /
(or tab on the /
button next to the text field), the command menu should come up.