You can resize the object to fit the size of other objects, or change them individually.
Procedure
The size of the object is increased or reduced accordingly.
Tip
If you use the corner handles with the Shift key held down, the proportions of the object will be retained.
If you keep the Ctrl key held down, the center of the object remains fixed in place despite the change of size.
If you keep the Alt key held down, the grid will be ignored when the size is changed.
You can also combine the keys.