There are no benefits for this either on a UX point of view or UI point of view. To create a pleasing visual interface using the margin around the body you would need a bigger margin that will cost you some estate without benefits so short answer is no.
White space is required in a web page if there is a issue with white patch on the screen. It is better to run the color and have space before and after the code. Additionally, it is easy to code and manage pages with a standard guidelines. Like this page also has some margin in every side.
It seems like your current table is a cluster of right click functionalities per column , links, buttons and dropdowns.
I would assume that there is no structure or logic as to where actions are placed.
So I would advise you to first look into structuring your actions.
After that you can look into how you want to group them.
1. Action per column