I found a solution :
Copy with elementor the menu section of the Erzen Header template and paste it on another Header template (here Ishmi Header), I replaced the Ishmi menu with the Erzen menu via Elementor.
When I go to “Codeless Header/footer/bloc” – “Erzen Header” and delete the page associated on the “Erzen” template (section “Display on”), the horizontal scroll work but the menu on the left disappears.
