After submission, MooMoo prompted that the transaction is a margin with the following highlight "If buying will use margin"?

Go to the bottom click me then settings then click on trade and click margin trade then turn it off. They might say it brings unintended problems. BUT NOTHING WILL HAPPEN. You will never be asked about margin trading anymore. If you don't have enough cash it will say not enough balance.PERIOD! Margin trading is RISKY. Just like a bank loan when you have en money to trade.

I know it~ when you transfer in SGD first, then you do the currency conversion. e.g. you buy US stocks, you convert from SGD to USD , then will not use margin leh