Ortur laser master 2 burning less than the provided measurement

I am using Ortur laser master 2 to burn some words on wood items.
I have noticed the leaser head is burning the provided order, but not accurate 100% .
Is there a way to adjust the burning on the laser please?

A visual aid would help understand the problem better.

Thank you and sorry for delay response.
As you know there is a percentage section besides to the size of the drawing.
for example if my drawing is 10 x 10 the laser will cut 9x9 so i have to increase the percentage by 10% sometimes more and sometimes less. So I have to keep trying and this is wasting of time and materials.
What do you recommend please?

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