DislikedI tried to close 1/2 as you suggested, but received a message "hedging not allowed".Ignored
I just checked again on my IBFX demo.
You went to the terminal and clicked CLOSE ORDER, then selected the volume box, and then clicked close.
You can not just use a market order cause then it is thinking you are trying to hedge(when it should just close it as half either way but for some reason these mt4 brokers are weird).