Divide canvas

Does anybody know how to change the size of a divided canvas?
I divided a canvas in 5 parts


and now I would like to have 4 parts with the same size and the last part with only the half size…
thanks for help

If you need special division and pad sizes, it is easier to create yourself the pads at the needed positions without using Divide(). Divide() produces equidistant divisions along X and Y.