Can someone give me a hint why the size of the preview (e.g. 40 mm x 10 mm) does not match the size of the lasered object?
The lasered object is about 4x larger than the preview.
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I see that you have an Elekslaser a3, so you use GRBL controller?
If you go in “edit”/“machine settings” you should see your controller parameters.
your #101 and #102 parameters should be 80
Here are mine, only for example :
be carefull : my parameters are not stock ones, I have modified my machine (limit swithes added)
I hope it can help… 
Yes - I have installed the GRBL 1.1.f firmware on the Eleksmaker Mana SE V3.2 board.
Have you installed this additional board for Endstop? I also ordered this board from AliExpress.
I will check the machine settings tomorrow - thank you for this hint.
Let me know if that was the solution!
Off topic :
I have added normally open switches according to this schema :
1 switch between ground and D9 + 1x100nF capa
1 switch between ground and D10 + 1x100nF capa
2 plugs, wires are soldered at the back of mana SE board
switches are screwed on little 3D printed part. This one is Y switch.
You made my day !!! … but you mean #100 (x) and #101 (y) - right? #102 is z-axis 
All standart parameters were at 250 mm. Now set them to 80 and perview size and lasered object size are the same.
Exact ! I made a mistake ! 
You can now play with LightBurn and your elekslaser machine ! 
Don’t forget to put $32=1 (enable laser mode). This is a question often asked by GRBL users… 
Playing - hmmmmmm not really - because I don’t trust the original glasses. So the idea is to use a USB camera with the option in Lightburn to take a look at the workspace.
… but Lightburn doesn’t find my USB cam 
In stand-alone mode the USB cam works perfectly, but I can’t select the cam in Lightburn because the Cam pulldown menu is empty.
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