Make DIVI Blog Category pages have 2 columns by default

Add this custom CSS code to your DIVI Custom CSS box and you will have blog posts split into 2 columns.

.archive .et_pb_post {
float: left;
width: 45%;
margin-right: 5%;
}
.archive .et_pb_post:nth-child(2n+1) {
clear:both;
}