SojaLin To reverse the keys, select the keys using box selection and then move either the left or right edge to the opposite side to reverse the order of the keys.
Actually, a convenient new feature was recently added to version 4.3-beta to make key reversal even easier. Previously, since reversal based on the center of the selected range wasn’t possible, reversing by moving the left edge to the right required a two-step process. For example, after selecting a range from frame 0 to frame 30, you would first need to move the keys from frame 30 to frame 60 and then move the entire set of keys back to frame 0.
Starting with version 4.3.56-beta, you can hold Ctrl (cmd on Mac) and drag the edge of the selection to move it relative to the center. This makes reversing the selection a one-step process, as shown in the video below:
