Is it going to return?
Hmm, I think there is no good reason to leave it out.
For us, the size of the canvas is no longer that important, as we have scrolling and the size adapts to the device the prototype is shown in. The canvas can more or less be seen as a browser window an dis not really fix.
But I can see that it is still used frequently and therefore can be located in the style bar.
Would be appreciated!