The screen shot beklow is DateTimePicker.Height = 24
Same size on screen as the default value.
Have I to set it to 100 to see a difference ?
I saw that it does nothing. 
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Dommage, je n’ai pas de jardin, sinon, je serais allé y planter des choux, à la mode de…
In fact, these Properties (Width and Heigh) do something; not obvious and I do not undertan the use…
DateTimePicker1.Height = 240
DateTimePicker1.Width = 240
DateTimePicker1.GraphicalDisplay = True
It makes two differences: if you click outside the Control, but in a square of 240 x 240, you activate the Control.
The Control real Top is the same as the two other Controls partially copied…
Are plugins an option for you? The Einhugur Date and Calendar controls are far more well designed than the DesktopDateTimePicker which has a depressing backstory of “we won’t fix that”.