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Hi,
We are glad that you have solved the issue of stopping check in/out. Per your requirement of version tracking in SharePoint, please go to your library> Settings> Library Settings> Versioning Settings> See the following screenshot.
You can refer to this article: Enable and configure versioning for a list or library
To view the version history of your file, please click the file> click three eclipse> Version history> see the result. For more information, see https://support.office.com/en-us/article/View-the-version-history-of-an-item-or-file-in-a-list-or-library-53262060-5092-424D-A50B-C798B0EC32B1[View the version history of an item or file in a list or library](https://support.office.com/en-us/article/View-the-version-history-of-an-item-or-file-in-a-list-or-library-53262060-5092-424D-A50B-C798B0EC32B1)
If this does not meet your requirement or I misunderstand it, please point it out and tell us more details, we are willing to help you all the time.
Best regards,
Gloria