The order book can be shown several ways. Open the gear menu (in the order book header, or on the Canvas toolbar) to choose. Your choice applies everywhere in Pro.

• •1-sided (default): asks above bids, on the side you’ve selected.
• •2-sided: Yes and No shown as independent columns side by side.
• •Maker: both columns show the resting bids (what you’d join as a passive maker), highest price at top.
• •Taker: both columns show the asks (what you’d lift as a taker), sorted so the price ladder reads top to bottom.

Full order book

In Maker and Taker views, turn on Full order book to see the complete price ladder from 99¢ down to 1¢, not just the levels with resting size. The Yes and No columns are aligned so each row is the same underlying price seen from both sides (Yes 99¢ and No 1¢ share a row), and the two sides’ liquidity meets in the middle at the spread, the way a traditional trading ladder reads. It’s off by default.

Hide fractional shares

Also in the gear menu: round displayed sizes down to whole shares and hide levels that round to zero. This is display-only, it never changes how your order is priced or filled.

Clicking the book

Click any level to prefill the order panel. In Maker/Taker views the click sets your price; in Taker view it also sizes the order to the liquidity available at that price or better.