Standing Orders are gone. The Market is now a plain market: SELL lists every material you hold that the station has a price for, sorted by sector like BUY. Type how much to sell on any rows, or press MAX, and one SELL press sells them all.
Everything with a price can be sold now, including raw materials like Dirt and Water that never had an order before. Keys never appear: boss cores, Boost Cards, Navigation Data and the Quarantine Clearance.
Each sector shows how many Liras an hour your production would fetch at current prices, and every row shows its net production.
Warp and Recursion bonuses now apply to buying as well as selling, so buying a good and selling it back always loses Liras. Before, after several Warps, it made money.
One price everywhere: the Market, the Inventory and the Atlas show the same number. The Standing Orders premium and the supplier bonus went with the orders.
Update: A Normal Market · Horizon Idle patch notes · SteamPeaks