How to hide "This is the content for Layout P Tag"

what theme are you using?

does this also happen with the default theme Twenty Fourteen activated, and when you deactivate all plugins?

https://codex.www.ads-software.com/Forum_Welcome#Include_as_much_information_as_possible

I use Engrave (Lite) theme.

Yes

my website: https://www.ampc.pspadelis.gr/

please post in your theme’s forum at https://www.ads-software.com/support/theme/engrave-lite/

try to temporarily deactivate all plugins to see if that helps.

The problem is not from the theme.
i deactivate all plugins but nothing change.

It’s from Dreamweaver..