Breakpoints for Devices

Or mobile breakpoints.

Content should be optimized for all end devices of all sizes in order to offer the user an optimal experience.

Depending on what you want to present in your store, you should define the breakpoints individually. I have preconfigured the breakpoints for you in the theme:

Theme - Settings Breakpoints

The entries are tried and tested standard values that are optimal in most cases. You should only change these settings if you are really sure!