Follow these steps if you want two buttons to appear right next to each other on mobile devices when you design your website:
- Add a button
- Go to the Advanced > Positioning > Width > Inline
- To make a second button, duplicate the first button then repeat Steps 1 and 2
- To set a gap between the buttons, go to Advanced > Margins
Source: How to Add Two Buttons Side by Side in the Same Column in Elementor