depends on your settings, your order type you submit, which specific exchange you target, and numerous other factors. If you would hold back your horses and check things out on IB's website then you would figure it out yourself.
The presumption here is that a choice can be made to transmit or not a limit order. Where? When I click transmit that is not good enough? And that the default is held on IB's servers. Seems odd. No such option anyways that I am aware of. Normal behavior would be this. Limit order placed, it shows up live on a public exchange. This is not the case.