To check the minimum lots per symbol using the platform, select the product you wish to trade from the market watch. Click on "new order".
An order box will pop up.
Under the volume field, you'll see the lowest lot size you can place.
If you wish to know the maximum lots that you can trade for that symbol, you can type in the lots you wish to check.
Note: If the Buy and Sell buttons are greyed out, it means that the lot size you entered can't be traded.