How do I change what /start does on my telegram bot?

setting exact keywords, i did both '/start' and 'start' Why when running start its correct, but when running /start it gives me some default message I cannot change?

The /start message is the default "Get Started" reply, but you can customize it. To do so, navigate to Telegram Bot Manager → Actions Button → Get Started and edit the text reply. You can also add additional reply elements if needed. If the issue persists, please submit a ticket to our support desk. Thank you!