How to Check Version of SharePoint Online
SharePoint Online is not like that on premise on how end users handles versions
But in case if you want to know the version of SharePoint Online:
There are several ways:
Like using service cnf, fiddler or PnP Script
Let us check cnf way
Open your SharePoint site in browser https://[your site url]/_vti_pvt/service.cnf
You will get this:
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