How to return from CK to the Joomla editor & HTML?

Hi,
When I switch from Joomla editor to PageBuilder CK, I no longer understand how I can switch back? Any ideas?

And the second question, how can I switch to HTML code editing in the CK editor (there is such an option in the Joomla editor)?

Hi
once you have switched to Page Builder CK you can not revert. This is to avoid mistakes in the code
if you REALLY want to remove it, you can disable the plugin "editor button - page builder ck editor", it will disable it. Then save your article without it, and enable again the plugin

if you are talking about the editor use to edit the text, this is specific to the editor (JCE or Tinymce). It shall be in the toolbar Tools >> Source code

CEd

is it possible to see and edit HTML code in articles through PageBuilder CK?

you can not edit the html code of the page builder
if you did that, you would break everything