One of the page of our site is not editable, on checking its properties we found out that the has a property "jcr:isCheckedOut" marked as false and that's why we were not able to edit that page.
I could just find that it is related to versioning. But could not figure out, how it happened and to change it back to true.
In the Touch UI if you edit a page, click on the Page Information icon in the top left (this depends on version). There should be a Lock Page or Unlock Page option to prevent someone else from editing the page while you are making changes.
In the Classic UI you should be able to Lock and Unlock the page from the SideKick's page information tab.
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