Hi,
In general, the “Frequently bought together” option is enabled by default but in any case make sure that you have it enabled in Theme Settings -> Shop. With “Products columns” you can adjust the columns in the “Frequently bought together” section on any device.
The “Form width” configures the width of the form of the “Frequently bought together”.
Navigate to Products -> Frequently Bought Together and create a new “Frequently bought” bundle with the bundle products you need. For each bundled product as well as a primary product you can set a discount.
https://xtemos.com/docs-topic/frequently-bought-together/
Best Regards.