Generally speaking layout very much depends on the template and other extensions so this is usually up to the users to make it work perfectly. But we might give you some advice if you describe your problem and possibly add some screen shots, "it does not work" is not very informative.

Thank you for your reply.

Here are some details with 2 screenshots

The first one is the article layout on the frontend and the second one is the result in the administration part of the website.

The paragraphs disappeared when the article was recorded.

I use the Protostar template

This is no related to Seblod - either your editor is filtering out html or your frontend template shows paragraphs/linebreaks differently than backend. Check if breaks are present if you display the article on the frontend (or if you edit it on the frontend), if yes, then template css is to blame. If also frontend display does not have line breaks then your text gets filtered - in that case check you Joomla filtering settings and fitlering settings in the editor.