Thanks for the suggestion.
I checked in dimensions under document properties, but still couldn't find the one i am looking for.
To give more clarity on the question,
I need to change the spacing / gap between the dimension value and dimension line. (highlighted in yellow in the below image.)
Thanks and regards
The only way (I'm pretty sure) would be to do it manually. Click in the text box just after the value, hit Enter on your keyboard, and then hit your spacebar a time or two. This could be saved as a Style to apply it to new, or existing, dimensions.
The gap between the dimension text and the dimension line is not editable.