Hi Marie-Claire,

Thank you for reaching out, and sorry for the inconvenience.

The 'Fullwidth Center Preset' does not have a suitable position to place a custom top bar above the header.

To achieve this, you may need to create a custom header and position the top bar above it. You can follow this guide on how to create a custom header in Helix Ultimate:
Helix Ultimate - Custom Header Documentation.

Additionally, understanding the Helix layout structure will be helpful.

Let me know if you have any further questions.

Best regards