Read the statement by Michael Teeuw here.
how can I display MM on my 2nd screen (just one pi 4)
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 hi, 
 how can I display MM on my 2nd screen ?
 thx
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 @sdetweil Thx for your help. 
 In fact, x is the abscissa of the letf corner of your MM. So, you have to take in account if there 's a second screen on the left. In this case, x would be the width of the left screen. If not, x would be 0.
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 @Axel51 said in how can I display MM on my 2nd screen (just one pi 4): x is the abscissa of the letf corner of your MM eh? if u have two screens left and right, in port 0 and 1 then to get MM to display on the right monitor, in port 1, u need to set x to the width of the left monitor (port 0), and If you are doing above and below y (instead of x), the height of the monitor 0 in pixels. on my desktop in use x:1920 
 on my pi i use x:3840 (running in 4k mode)
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 @sdetweil yes absolutely 
 you can do the same with y
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 @Axel51 for rpi, there is only one display port number 0 
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 @Axel51 i was talking about the the physical ports on the PI4. not the logical DISPLAY number 
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 @sdetweil ;-) 
 Thx for all!
