It is very important to read these. Global items are a major feature of the website. They keep the layout of the site uniformed to all the pages.
How to edit and what to avoid with a global item.
Note: Global items within the page builder are easily identified by their green color. If you are editing a module, row or section that is green, or if the current modal settings window that you have open is green, then you know that you are currently editing a global item. It’s important to know when a global item is being edited, because any change you make will be mirrored across every page that item has been placed on.
DO:
Edit those that have red icon on the left side.
DONT’s:
Edit fields that have a green icon on the left side.
In this case you can edit the Title (red), and you can’t edit the Content (green).