Hi @sereneluminaire , base on your image I believe that layout is a tab element
If your theme doesn’t support this feature, you might need to consider hiring a developer to implement it for you. Alternatively, you could use a page builder app that allows you to add such elements directly into the editor without the need for coding. Then, you can drag the section from the page builder app back into your theme. Some page builder apps that could help include Shogun, PageFly … Most of them have free plan.
Here is an example from Whey template from PageFly
Hope it helps!