Hi,
thanks for your post, and sorry for the trouble.
As these are English-language forums, I’ll reply in English. That way, more people can benefit from our findings, I hope that’s ok.
From what I can see, this is a problem in your theme, TablePress is working as expected.
Here’s a screenshot of a “larger” phone, an iPhone X: https://imgur.com/ckQufFa
As you can see, the table is very narrow only. This is caused by your theme only using a very small content area on small screens, i.e. it keeps very big margins on the left and right side of the content. The table then takes up 100% of the content area that the theme gives it.
Thus, to make the table bigger, you need to find a way to make the content area wider in the theme. This might be as easy as using a different block or element in the block editor that your theme uses when you write the content of the page.
Regards,
Tobias