Hi Vladimir,
Starting with the post author, you may remove this by unchecking “Display post author” in Appearance > Customize > Layout > Blog > Content > Archives
With regards to the missing “read more”, are you using a custom excerpt as such?: https://share.getcloudapp.com/ApuJPvy0
Using this removes the “read more” button. To make is show once more, you’ll need to re-activate it through a PHP snippet: https://docs.generatepress.com/article/activating-read-custom-excerpt/#read-more-text
Kindly use the appropriate snippet.
Adding PHP: https://docs.generatepress.com/article/adding-php/#code-snippets
Adding it through Code Snippets should work.
Hope this clarifies! Kindly let us know how it goes. 🙂