Hi,
If you want to link a section of the same page, you may follow this:
- Give ROW/Section name in field: Section ID
for example: testSectionName
remember no # or space between, only "-" if you really need to
- In menu item > External URL type > #testSectionName
If you want to link a section of a different page, you have to try using the whole URL with http(s), for example:
https://domain-name.com/#testSectionName
Hope this helps!
Note: The Helix Ultimate Template is not made for onepage template, so it may cause some unwanted behavior in the offcanvas functionality.
Best Regards