Trading risk management
Risk tools here are measurement plus a written plan. There is no hard lockout on a live broker.
What you can see
Per-trade P&L and commissions, sprint equity, streaks, largest loss. That is enough to know if size is the problem.
What you still have to do
Write the cap in the plan. Stop when it hits. Kelly % in reports is a hint, not a green light.
FAQ
Does 54Trades size my positions?
No. It can print a Kelly percentage from history. You type the quantity on the next fill.