Space between columns in table

[Aabel]

Hi, 

I'm struggelig to remove the space between the columns in the table below. Where and how can I change this?  

[Assaf_m]

you can change the color of the borders to be the same as the background color in the default table settings...

check below screen

[olivia_magiera]

Was there any update on this? I am having the same issue and the padding is set to 0 and adjusting the borders for columns and rows does not help.