View pages and Dashboard in different domains

Dear Forum

I’ve just used a new host server company to set up an install of WP.
Unfortunately, the host server’s control panel was in Polish language only, which meant I had to blindly follow instructions from support when doing the install.

Through this I ended up with an install located in the directory:
https://serwer1397424.home.pl/autoinstalator/wordpress/ which I was then then given further instructions to re-direct to my domain name poland-today.pl.

Finally, to complete the install I then went into my wp panel (serwer1397424.home.pl/autoinstalator/wordpress/login.php) and set both site url and wordpress url to https://poland-today.pl to finish the configuration.

However, this didn’t work so I tried correcting it by hard coding the following into my wp-config.php:
define(‘WP_HOME’,’https://poland-today.pl’);
define(‘WP_SITEURL’,’https://serwer1397424.home.pl/autoinstalator/wordpress/’);

This worked, my site came up online. But unlike all other installs of WP I’ve used the view pages addresses (poland-today.pl) were different to the login and dashboard addresses (https://serwer1397424.home.pl/autoinstalator/wordpress/) and when viewing pages while logged in I did not have an edit link or a dashboard menu navigation bar across top. It is as if the user and administrator get directed to different domain names.

Can anyone tell me how to correct this and turn it into a conventional install with both view pages and dashboard via the poland-today.pl domain.

Thanks

Tim