This is a blast from the past that works well with macOS Catalina. Bradley Chambers:
Front and Center by John Siracusa and Lee Fyock is one of those apps you’ll never live without once you get it installed.
What does it do? John Siracusa:
In classic, when you click on a window that belongs to an application that’s not currently active, all the windows that belong to that application come to the front. In Mac OS X (and macOS), only the window that you clicked comes to the front.
I don’t like that. Front and Center fixes it.