Twin Monitor setup doesn't save?

I set up a second monitor, you can see the fun I had on an earlier thread here https://www.linuxquestions.org/quest...rs-4175690545/
How ever the setup doesn't persist across boots consistently.

Sometimes it's good, more often than not it doesn't return to the way I left it when the machine was shutdown.

The images show how I want it and this is xrandrCode:jonke@charlie:~$ xrandr
Screen 0: minimum 8 x 8, current 2944 x 1080, maximum 8192 x 8192
DP-0 connected 1920x1080+1024+0 (normal left inverted right x axis y axis) 598mm x 336mm
1920x1080 60.00*+
DP-1 connected 1024x768+0+0 (normal left inverted right x axis y axis) 0mm x 0mm
1024x768 60.00*+
DP-2 disconnected (normal left inverted right x axis y axis)
DP-3 disconnected (normal left inverted right x axis y axis)
DP-4 disconnected (normal left inverted right x axis y axis)
DP-5 disconnected (normal left inverted right x axis y axis)More often than not the Mirror Displays setting is ticked on the Configure screen settings and layout Display util.

I know I can save my settings as config file but I dn't know how to do it

Examples I've found look like thisCode:xrandr --newmode "my1280" 108.0 1280 1328 1440 1688 1024 1025 1028 1066 +HSync +VSync

xrandr --addmode DVI-I-1 my1280Obviously not my setup, but how would I create one for my two screens?
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