Oh, take my apologies, missed that.
1) Don’t use left-right margins for the elements of the Static block (neither rows nor columns or images).
2) Use padding for the row with the content https://prnt.sc/1x3l2yp
3) Use columns gap if you need to add space between columns https://prnt.sc/1x3lvgo or use columns padding if you need.
4) you can change the width of the mega menu by changing the number of columns here https://prnt.sc/1x3m617 because it works like width limit for cases when you use Static block for the mega menu than default mega menu way.
