Embodiments of the present invention disclose a quick screen splitting method, apparatus, and electronic device, a display user interface (UI), and a storage medium, and relate to the electronic field. The method includes: detecting, by a portable electronic device, a knuckle touch gesture acting on a touch-sensitive surface of the portable electronic device, and splitting, by the portable electronic device, a UI into at least two display areas in response to the knuckle touch gesture. The knuckle touch gesture includes a knuckle touch action that occurs when a touch-sensitive surface grid capacitance generated by the knuckle touch action acting on the touch-sensitive surface is within a first preset capacitance range, a quantity of non-zero capacitance grids is less than a preset value, and a Z-axis direction acceleration signal is within the first preset acceleration range.