The new Gap tool (U) works on the “white space” between frames. Position the mouse between two items, click-and-drag to adjust the position of the gap, and the frames on either side of the gap will adjust at the same time-the uniform gap width will be maintained. Hold down the Shift key to only adjust the two closest items relative to the gap. Hold down the Command (PC: Ctrl) key to resize the gap instead of moving it.
