Merge two column to one in a section

[Maxdanam]

Hi, I need your help the way to merge two colums in to a one in a section. Basically i brought a theme which made by elementor and it has 2 colums in a section and 2 colums are with 2 categories. All i need is join these two colums to a one and do a single category. Kindly guide me the way to solve it. Thanks in advance