An electronic device and a method for controlling a screen thereof is provided. The electronic device includes a flexible display, an image sensor, at least one processor, and a memory, wherein the memory may store instructions that, when executed, cause the at least one processor to display a first preview image on the flexible display in response to activation of the image sensor, divide the flexible display into at least two regions in response to detecting a designated first event, display a second preview image in a first region among the divided regions, and display at least one captured image in a second region among the divided regions, wherein the second region may include at least one first control menu varying based on a property of the at least one captured image.