It doesn’t feel intuitive when you already have one stock in your holding and If you want to sell/buy it.
Definitely, you need exact information about current market price (bid/offer) when you are placing order.
But for that you have to first add that stock to market watch list.
If we have “Depth” option then it will be very helpful.
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We already have same question regarding it… But it is old and closed so I couldn’t reply on that.