How can I create a certain space between columns in the matrix?

Hi,

I have a problem with the matrix.

!

I want there to be a certain space between the columns "trifft völlig zu" and "nicht beurteilbar".
Alternatively, it would also be desirable that the entire(!) column of "nicht beurteilbar" is highlighted in a different color.

Unfortunately, I can't find a cursor to pull the columns apart, as you can do in Word, for example.
Furthermore, I am unfortunately not familiar with JavaScript, which is why I cannot create any code to solve the problem.

I am very grateful for your help!

Best regards

Laureen 😀