Thanks Ofi and Pavel for your answers.
I know it's not good for SEO to use Ofi's way... and then custom css would certainly be an option.
The fact is that we have worked with Themler for years and in it you can build your header in columns and easily set the width per device and use the flex setting per column to arrange the order per device.
It is a shame that Themler is no longer supported at all, so we are forced to look for an alternative.
All those page builders are quite nice, but when it comes to the possibilities to create a nice header within the software, it is very disappointing with SP Builder, Quix and Nicepage.
There is also no support for other extensions within SP Builder. So when using extensions such as Hikashop, VIK appointments, RSTickets and Membership Pro, the pages do not look good and a lot of CSS has to be used to make everything look good again... and that means extra work. Nicepage is the only one that handles this well.
In short... SP Builder is great for the content of your website... as long as you continue to work within their standard pages. So in my opinion it is not suitable for more extensive websites/shops.
Regards,
Michiel