Elementor. How to make it so that on computers, tablets there are 2 columns, and on mobile 1?

Question

JavaScript

Hi all! Essence of the question:
I bought a theme for a freelance exchange on wordpress. I know that the idea is not very good, but limited time and budget. The theme is made using the Elementor builder. I decided to make the main page in fullpage, respectively, using fullpage.js. It is necessary that there are 2 columns on computers, tablets, and 1 on phones. I have already tried everything. Someone help!)

Answer 1

var json = '{"reply":"Файл загружен","img":"20151002172921131.jpg"}';
var data = $.parseJSON(json);
alert(data.reply + ", " + data.img);

Answer 2

Google about css media queries. And learn to make websites using normal technologies, and not by poking through a builder.
In general - you have a freelance exchange - so publish a task on it. You will be the first customer.