Yes, I know that IB added support for the overnight session. I did create orders of type “Overnight + Day”, but they always get cancelled if they don’t fill within 1 trading day. As opposed to Schwab: Their GTC+EXTO order remains working for 6 months (the EXTO type also cancels after 1 day).
If I want to buy the next dip, I want to set and forget a limit order that remains active for more than one day. And I want to get filled no matter which session reached that limit price.
As far as I can tell, the whole user interface did not catch up to this new development, e.g. the description of the “Outside RTH” toggle button has no mention of the overnight session.
Schwab ToS-Platform order types:
Maybe this is of interest to you: Google “overnight session + grandmother of all anomalies”.