These also apply to selected widgets.
Bigger (+) – Grow selected widgets.
Smaller (-) – Shrink selected widgets.
Same (=) – Make all selected widgets the same size as the largest one selected.
H closer (c) – Move the selected widgets closer to each other horizontally (along the X axis).
V Closer (C)– Move the selected widgets closer to each other vertically (along the Y axis).
H further (f)– Move the selected widgets further from each other horizontally (along the X axis).
V Further (F)– Move the selected widgets further from each other vertically (along the Y axis).