How to use percentage to choose contract size?

After selecting leverage, traders can modify contract size corresponding to the proportion of available margin through the percentage function of the order area.

Please note the following:
1) Contract size does not automatically change when the leverage is changed. When you change the leverage, your margin will also be modified automatically.

2) Due to the difference in the calculation of margin between buy and sell contracts, the Contract size will display the smaller value between them. If you open Long by using 100% available margin and 100 times leverage, you can trade contact size with 200000, while opening short can trade size with 210000, the system will take the lower of the two and display 200000. So after the order is successfully submitted, the remaining margin available will also be shown.

3) The contract size of a specific conditional order is calculated based on the trigger price you choose. If 100% of the available margin were to be used, the conditional order may be rejected due to insufficient margin. The reason is that the execution price of the final order may deviate from the trigger price, thus requiring more margin to execute.