During a game, click on your profile name above, below 'piece set' setting, to activate 'Zen Mode'.. simple said, this mode remove all the distraction, and just display board and clock..
it remove left sidebar (chat, name, rating) , right sidebar (move list, opponent rating (only) and bottom game counter
@MohammadAayanKhan In my opinion people only do this because they see it causes damage. But emotional damage can be prevented. If you just ignore everything they say and don't react to whatever they do, there won't be any fun or point of doing this. And they would just stop. Maybe try this.
@MohammadAayanKhan You should simply ignore and block the user. And if you think the user creates multiple accounts then report it to lichess. ANd while playing games use zen mode and ignore the spectator chat. Remember, just pay no attention to it.
Report that guy to lichess by a brief description with correct explanation and give a correct reason for why you are reporting him. It is better if you can explain it by a link. lichess.org/report