/kick

Disconnects a player from the server. Unlike /ban, the player can rejoin immediately.

Syntax

/kick <targets> [<reason>]

Name	Type	Required	Description
targets	entity	Required	The player to kick.
reason	message	Optional	The reason for the kick, displayed to the kicked player.

/kick Steve AFK too long

Kicks Steve from the server with the message "AFK too long".

/kick @a Server restarting

Kicks all players with the message "Server restarting".

Using /kick instead of /ban when you want a permanent removal, kicked players can immediately rejoin.
Trying to kick offline players, /kick only works on currently connected players.

The kick is immediate. The reason message is shown in the player's disconnect screen.

Try these commands on Astroworld or host your own server.