Contract trading in real time

I noticed i cannot buy
(1) contract which equals (EST. cost: 0.00000473 BTC)> which is<> (EST. Value: 0.05 USDT) in real time the minimum buy is 0.001btc (EST. Value: 10.88 USDT) ???

how will i be able to average down ? and also where is the (pnl)un
Total margin. position margin. frozen and available . will these feautures be added to the portfolio? we need this…

the minimum buy is 0.001btc (EST. Value: 10.88 USDT)???

Regards