If you set more than one column for the block, it is required to set how the elements from columns will be rearranged on mobile devices.
Set two or more columns when setting the block container.
The option for responsive behavior will appear in the bottom part of the form.
Set the "Standard" option.
The standard option means that the element from the right column will be rearranged below the element that is in the left column.
Set the "Static" option.
Both elements will be displayed on the mobile devices in the same way as on the desktop version. This means that the elements will be next to each other.