Export/Import with XLSX

-- url of the page with the problem -- : on my local server
-- HikaShop version -- : 5.0.0
-- Joomla version -- : 4.3.4
-- PHP version -- : 8.2.1
-- Browser(s) name and version -- : Firefox latest
-- Error-message(debug-mod must be tuned on) -- : NO ERRORS

Previously, 2019, I established a Shop for a friend with 14 categories, 1,100 products (including references to all product images, 4 for each item) Additional images, Options, Attributes, Specials, Discounts, and Rewards
Each of these was in a separate tab in an xlsx file

These were imported and exported regularly when products were added and removed depending on availability along with pricing changes.
The shop owners were basically luddites and managed this really well

Haven't been using HikaShop since 2020, so I figured I'd add 2 items with all the attributes required and export as default.
All I get is a csv with 4 lines (attached) . Documentation relating to export/import references columns, there are none.

This new shop is to have 400 items, with similar attributes as previously, and I'm feeling uncomfortable setting it up
More importantly is this needs to be pain free for the owners to do their thing.

What am I missing?

I'm on a Mac and what is attached is what I get opening the .csv in Excel
I downloaded Libre Office and opened the same file.
Attached is what I get.
I shared the file with others with same configuration with the same outcome.

It may be useful if anyone else gets a similar outcome to try the same.

Thanks for the response