log into joomla and go the Global Configuration and edit the site tab, it has nothing to do with the templates

How do I change this in the Global Configuration and site tab?

if it is j51_emani you don't want to be shown, try renaming de template zip file and install it again. It just links to the files of the template and not to the website name, those are found in 'meta name' and the top of your source code

Changing the name of a zip file makes no difference. Everything is written in various xml files etc. Templates are both in "your domain/templates" and in "your domain/media/templates/site".
If you change the wrong things, various extensions stop working as they look for the path that is the name of your template or something like that. I want the page's name on the template I bought, but it seems difficult?

Sorry for my English

Hello . It may be the translation, I'm not good at English. But I don't understand what exactly you want to change?
Can you add a screenshot here ?

If I have templates J51 - Nina installed on a joomla 4 page and want to change the name, it doesn't say "J51_Nina" in the browser source, but another name that I choose myself.