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Mysteriously, this extra divider-line has appeared between any app I launch now and the previously launched apps?
What is the purpose of this 2nd divider line? Why is it appearing now? How can I get rid of it?
See this screenshot, with pink arrow pointing to the mystery divider-line.
This is recently-opened applications, which is on by default in macOS Mojave. To disable, open System Preferences > Dock, and uncheck Show recent applications in Dock.
