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:
Other Helpful Links:
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