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There is no stack/layer management nor multiple element selection.
Elements are grouped by dragging one element on/in another. Grouped elements move with their parent(s)
elements using the del-Key or the toolbar button. Call up the resize
canvas dialog by clicking on the button, when you run out of space
Improve quickMockup on https://github.com/SlimerDude/quickMockup
made by Jan /@simulo
Change the size of the Canvas