Hi,
the issue is in the title 
Not any product (Magento sample data or new products) are displayed using categories or search. Only direct access through url works. Seems the config is right (2.3.2 without any extension, only Claue theme installed)...
- Index are ok.
- Cache disabled
- Products in stock, salable qty is ok. Even 'no manage stock products have the same issue. But strangely, even products 'in stock' on backend are 'out of stock' in front end.
Can't understand the issue, thanks for your help.