The Daily Loss Limit is Calculated on Net P/L starting at the beginning of the session (5 PM CT). It will include all fees, commissions as well as realized and open P/L. This value is monitored in real-time. When your Daily Loss reaches the amount entered, your working orders will be canceled, your positions will be liquidated and your account will be unable to place trades unless this value is increased or disabled.
To enable this, click on your account in the upper account bar and then click on “Day Loss Limit”:
Then check the box to enable the daily loss limit and enter a daily loss limit amount and save these changes: