There's an "enable dragging" option in the Accessibility settings, which lets you double tap on an object to start a drag without needing to use the physical bu

There's an "enable dragging" option in the Accessibility settings, which lets you double tap on an object to start a drag without needing to use the physical button. You can choose whether the drag ends when you pick up your finger, or if it continues until canceled with a tap. You can also set it to start a drag with a three finger gesture instead of a double tap with one finger.