You got a less than stellar recommendation based on your desire for parity with ease of use with windows. Lubuntu is a more niche distro aimed at lower resource usage at the expense of the ease of use you are looking for.
If you had installed KDE, you'd likely have explored the start menu and found gparted or typed 'disk' into search and found gparted.
Snaps are not "fine."
They're generally worse than debs, and worse than alternative "all in one" package formats like flatpak or appimage. And when coupled with "not packaged by the original devs" leads to issues where people have issues and then raise bug reports to the wrong people, but beginners don't know that the snap is packaged entirely by Canonical, and not Valve, and just results in a poorer experience.