Inverting Grid Orientation in Adobe Express

Is it possible to invert the orientation of a grid in Adobe Express? Using the example in the image here, if I want the single vertical on the left and the two horizontal images on the right rather than as the default, how is that done? I have been attempting to find the solution to this without success. I am certain it was a feature that was available previously. Perhaps it is something simple I am not seeing. Thanks for your help.