The copier controls, explained
Every engine control lives in one place: the top bar, on every page. It is the same on each of them: the state pill with the status word, then only the button that applies right now, a thin divider, and Flatten all. While copying, a thin green line runs under the top bar. There are no engine controls anywhere else, so you never have to hunt for the off switch. The controls drive one engine: your own copier, which no other customer's actions can stop or flatten.
On a phone the state word sits in the header on every page, and the buttons move to a dock just above the tab bar. The Desk tab's dock carries them in full, Risk keeps Flatten all (plus Resume copying while copying is paused), and Accounts has no dock. Start and Stop are always one tap away on the Desk tab.
Which button you see
The top bar only shows a button that can act right now. While the copier is stopped you see Start copying. While it runs, starts or reconnects you see Stop. After Flatten all has paused copying, Resume copying appears beside Stop. Flatten all is always there, after the divider. For a moment after you open the app, before it has heard from the copier, the top bar shows no Start or Stop button (only a faded Flatten all) rather than a wrong one.
Start copying
The filled button, shown while the copier is stopped. From the moment you press it, every leader fill places real orders on your follower accounts. It looks faded until there is something to copy: at least one broker connection switched on, and a saved copy group with a leader. Press it while it is faded and a message says which step is missing. It will not start half-configured. A group with no leader is off, and starting skips it; the other groups start as usual.
Stop
Shown while the copier runs. Copying stops immediately. Open positions stay open on every account. Nothing is closed. Stop is for "stop mirroring new fills", not for "get me flat". If you want flat, that is the next button.
Flatten all
The outlined red button, always in the top bar. One click closes every open position (the leader's as well as the followers') at market, and pauses copying until you press Resume copying. It is faded when nothing is open, so you can read its state as "is anything at risk right now". Full detail in the Flatten all kill switch.
Resume copying
Shown beside Stop after Flatten all, or a leader's risk limit, has paused copying, including while a connection is reconnecting. It re-enables every group, including a group that stopped itself because its leader hit a risk limit. If a leader's own limit paused its group, that leader is also locked: unlock it on Risk Management first, or the group still copies nothing after Resume copying. After a full flatten, Resume copying re-opens nothing: the leader is flat, so there is nothing left to copy. The engine reconciles from the broker's live book and waits for the next fill.
When the copier stops without you
Four things other than your own Stop can stop your copier, and each one tells you:
- The broker signed the login out because the same login connected somewhere else (Rithmic or Volumetrica). The state pill reads an amber Stopped, a notification stays on screen at the top right until you close it, and the forced-logout alert goes out. See what happens on a disconnect.
- Your plan no longer covers copying: it was cancelled and the paid period ended, a failed payment ran past its grace period, or a downgrade left you more copy groups than the new plan includes. The copier stops within about a minute and a Plan limit message says which. See payment failures and the grace period and plans and copy group limits.
- MirrorFill support stopped it. The state pill reads an amber Stopped, Order history records "MirrorFill support stopped this copier.", and the copier-stopped alert arrives titled "Your copier was stopped by support" if you have that alert on. If you did not expect it, contact us.
- The MirrorFill server restarted, for example for an update. Your copier stops with it and does not start again by itself: the state pill reads Stopped, and a planned restart sends the copier-stopped alert (a crash cannot send anything, see notifications and alerts). When you press Start copying, your positions are read back from the broker, not re-traded (see restarting while positions are open).
Each is an ordinary stop: open positions stay open at your broker, and nothing in your setup changes. Press Start copying when you're ready (once the plan is sorted, in the second case).
One click by default
Every button acts on a single click. There is no arming stage and no typed confirmation. If you want a second look before the big ones, the Risk Management page has three opt-in switches: Ask before Flatten all, Ask before Start copying, and Ask before Stop, under Confirmations (a fold on a phone). They are off by default and apply in that browser only.
Using Flatten all, or the copier stopping for any reason, also raises an alert: an e-mail or Telegram message if you have those on (Flatten all also answers with a toast on screen). That is deliberate: an engine that stops while you are away from the screen is exactly the thing you would want to be told about. See notifications and alerts.
Quick answers
Does Stop close my positions?
No. Stop only stops copying. Every open position stays exactly where it is, on every account. Use Flatten all when you want everything closed.
Why is Flatten all faded?
No account has an open position, so there is nothing to flatten. The button enables the moment anything is open.
Why is Start copying faded?
There is nothing to copy yet: no broker connection is switched on, or no saved copy group has a leader. Or a copy rule change on the Trade Desk is not saved yet: Start would run the saved rules, not the ones on screen, so save or discard it first. Switch a connection on in Accounts and pick and save a leader on the Trade Desk under Manage rules, and it lights up. Pressing it while it is faded tells you which step is missing.
Where are Start and Stop on my phone?
In the dock just above the tab bar on the Desk tab. Risk's dock keeps Flatten all (plus Resume copying while copying is paused), and Accounts has no dock.
Start copying says copying is switched off for customer accounts. Why?
MirrorFill has paused copying for customer accounts for the moment. While it is paused you cannot start or resume copying, and your connections, copy rules and risk settings can be neither loaded nor saved, but a copier that was already running keeps running, and Stop, Flatten all and closing a position all still work. Try again later, or contact us.
Can Resume copying accidentally re-open what I just flattened?
No. After a full flatten the leader is flat, and followers only mirror the leader. Resume copying re-enables copying; it does not place orders on its own.