To solve this issue I have performed these actions:
So, if you need to remove join/left messages, use one of these bots:
Follow these steps:
/joinhide check- check if bot is installed correctly.
All this commands must be written to the chat that you want to configure. Do not send commands to bot via private messages.
First, complete installation instructions. Then type into chat this command:
/joinhider check. It should say OK.