Hi Sleapy,
If you are using a demo through IG , it would indeed be different than the videos you see for ProRealTime ‘ s V11 version, and would there for PRT – IG V10.3 version ( which is still different the PRT V10.3 you could have had with Interactive Brokers)
If however you opened an account directly from ProRealTime’s website, you could either have the Software version or the demo trading version ( getting ready to open an account with Interactive Brokers)
In that case, all that you listed previously could be possible.
You may create your own order types.
Margin requirements will be displayed in the order entry before sending the order to the market
Of course you may change the order quantity ( before it is executed, obviously 😉 )
There are order types: “Market when open” to have a market order on the official opening time.
Have a good day!