Data not displayed in UI after Database connectivity

After connecting to the database from my server, the product details and pictures are not displayed............ The UI only sees the register page and other nav bar elements.

could you help me with your solution/idea on it?

Where is the database from - is it an old version upgraded - did it previously have multiple stores configuration ?
Or is it a fresh new database in which case - did you enable demo products ?

If not a new database one option is to run the Install and create a fresh new database with the demo products enabled and verify everything is working.
If that is all good then you know it is something with the old database

I have installed a new database connectivity, using Postgres and also with SQL server separately.
There are no data items in the Product table itself.

I checked the "includes product" checkbox, but nothing worked as expected.

is there any solution, whether in database connectivity?

See the install documentation.  If you want sample data created during the installation, then be sure to select the checkbox "Create sample data".

https://docs.nopcommerce.com/en/installation-and-upgrading/installing-nopcommerce/installing-on-windows.html#install-nopcommerce

This worked , thanks!