To avoid multiple users in Omni CMS simultaneously making changes to the same page, Omni CMS has a Check In/Check Out feature. If a page is checked out to you, no one else can access that page until you check it back in.
When an Omni CMS user clicks on any green Edit button, it automatically "checks out" the page to that user. The page can be manually checked back in by clicking on the lightbulb icon. The page is also automatically checked in when it is published.
You can see whether a page is checked out to you or not with the lightbulb icon shown below.
Checked Out
Checked In
If a page is checked out to another user, you will see a red pad lock icon shown below
Checked Out to another user
If you open a page but do not publish it, you should always check the page back in before logging out of Omni CMS.