switching off Page Builder

I wrote my Home Page in Joomla using Tiny MCE Editor. I just switched on Page Builder once using the button at the the bottom of the editor page and it has hijacked the page. I cannot find a way to go back to my original editor. I need to put some code in to the page but when I switch to Code on the edit page, all of the code goes sideways instead of filling the page. So I can't see the code as it is off the page. I want to switch back to my old editor without uninstalling Page Builder.

Hi
Check in your articles, you have a versioning system (feature from joomla) that allows you to revert your article back to a previous version
CEd

Thank you,
I have done that now. I use the page Builder to alter the template of the site as that is how I built it but I have now disabled the Page Builder Editor Plug in. Out of interest, I have also started to design websites using Wordpress but now they have altered to the Gutenberg Editor I used the Classic Editor Plug in. I find the Widget system a lot more difficult to design with. Thank you for all of your work.