Hi Marek,
Yes, I have read your first question well, but those links were not working before, so could not visit them. And it was not clear to me that the last URL you have shared
https://manufacturer.marek76.smarthost.pl/ was not the website in question. I thought that is the URL you have given me to check. Sorry for that.
BTW, Now I can check the other two URLs, and they are looking fine at my end. Have you solved them, already?
https://prnt.sc/g7ZhZXNm_VS_
Note: Export & Import feature is useful only if you want to transfer basic template settings between templates, for example, Font selection, Layout settings, Color Preset etc.
Best Regards