If the product you are trading does not trade outside of regular trading hour session (like a US Stock option) the "Allow outside RTH" option within the Order Ticket or the Time-in-Force drop down will be grayed out and you will be unable to add the attribute. Also, MKT/LMT orders for a CME future and MKT/LMT/Stop orders for an ICE/Nybot future are active throughout the 24 hour trading day (both before and after the contract's designated RTH session) and do not require the Outside RTH attribute to be selected, so they too will be grayed out.
Why is the "Outside of Regular Trading Hours" option disabled on my Order Ticket?
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What are the key considerations for trading outside Regular Trading Hours (RTH)?
Will my order that is set to work outside RTH work in the US overnight trading session?
Why did my Buy Limit order get filled during pre-market hours?
Why is my order not active?