At FNmarkets, open positions and pending orders (e.g., Stop Loss, Take Profit) remain active on MT5 even if you go offline, as they are server-side. This ensures trading continuity and protects you against unnecessary market risk.
Trailing stops and Expert Advisors (EAs), however, require an active MT5 connection to function. To ensure they work correctly, keep your platform online, or you can monitor and manage your positions via the MT5 mobile app or WebTrader upon reconnection.