Abstract: In some examples, a merchant device may control access to features based on an orientation of a display. For instance, the merchant device may present a first user interface (UI) for enabling a merchant to enter transaction information. Subsequently, the merchant device may present a second UI to enable the buyer to interact toward completion of the transaction, and the merchant may change the orientation of the display to face the buyer. While the display is oriented in the buyer direction, access to the merchant UI is prevented, thereby preventing initiation of a new transaction, cancellation of transaction, etc. When the display is returned to the first orientation, i.e., facing the merchant, the merchant device may enable certain UI features such as for initiating a new transaction, canceling a transaction, or perform other functions that a buyer may have been restricted from performing.