The current version of the FIFO rule prohibits two main things: having orders of the same lot size and having orders in opposite directions. To ensure that all orders have different lot sizes, you need to adjust the '2nd Trader Multiplier' to a value that will result in the second trade having a different lot size from the first. The specific value you require depends on the risks you take and your deposit size.
Below you can see an example, where we changed the second multiplier from 1 to 2, and the third multiplier to 2.5:
For instance, if you are using small risks with a small deposit, you might need a multiplier of 1.5 or even 2 to change a lot size of 0.01 to 0.02. Conversely, if you have a larger deposit, a multiplier of 1.1 may be sufficient to change a lot size of 0.1 to 0.11.
Additionally, to avoid having orders in opposite directions, you should set the 'Allow Hedging' option to false.
This will help you stay compliant with FIFO regulations.