There are 3 ways to expand multi-leg trades in the Positions Tab.

Smart Icon – Click on the   icon to the left of the stock symbol, select ‘Expand/Collapse’.  Repeat to close.

Expand All – Click the button above the trade entries if you wish to expand all multi-leg trades.  Once clicked, the button will change to Collapse All.

Double-Click – if you want to expand one trade or specific trades, simply ‘double-click’ on an open space of the trade entry line.   Repeat to close.