Hi,
In my test, if both users are using the same account (either locally or remotely), the second session will directly kick off existing session without any notifications.
However, if they used different accounts, for the second account it will get notification like "Another user is currently logged on to this computer. If you continue, this user has to be disconnected from this computer. Do you want to continue?".
On the other side, the login user will get warning to action in 30 seconds:
All these behaviors are by design, kindly create separate accounts used for remote session will provide notifications when another session would like to interrupt.
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Hope this helps and please help to accept as Answer if the response is useful.
Thanks,
Jenny