If you post the buy order at a higher number, it will work up the order book. If you had bought 200 at a limit of 250 rather than 249, it would have bought 25 at 249 and then 175 at 250.
Alternatively , it’d be nice to optionally have an Order Book appear directly with the Trade window. At least personally, I always want the two open at the same time. It’d be a nice quality-of-life feature to have the option to auto-dock an Order book next to each Trade window.
This functionality is present in PMMG extended.
See also Buttons to increase/decrease price per step
In PMMG Extended a “price to fill” feature request: PCT Discord : PMMG Feature Requests : CXPO “Set Price to Fill”