How to set bottom right as the start of the led array?

[UkeHa]

So, my led's are starting on the bottom right hand site and rotate up and counter-clockwise. When i add the leds on the right side and counter the orientation it works like intended, but as soon as i add a row on the left hand site or on the bottom it changes the input start automatically. Is there an easy way to change it back? The matrix has an "input" parameter, perhaps something like that would be sensible for led strips as well?

[Sgadmer]

In the field "Eingabeposition" (Input Position), you need to enter the number of the last LED.

[Sgadmer]

And In one of the submenus, you need to set the starting position to "Bottom Right" (by default, it is usually set to "Top Left").