You might have had earlier versions called Lightroom 4, Lightroom 5, Lightroom 6; the next version of this exact same software was known as Lightroom Classic, at the time version 7, now all the way up to Lightroom Classic 9.2
The new software called Lightroom is a cloud-centric and totally new piece of software, where your photos are stored in the cloud. Although there are some similarities between the new Lightroom and other software like Lightroom Classic and Lightroom 6, the new Lightroom really is a different animal (kind of like a zebra with horizontal stripes) with a very different underlying concept and very different feature set.
If you don't want the new Lightroom, you can uninstall it, this will not affect Lightroom Classic.
As always, I take the opportunity to congratulate Adobe on their ability fo confuse people simply by choosing ridiculous and confusing names for their software.