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.

enter image description here


Recent apps

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.

screenshot of System Preferences > Dock > Show recent applications in Dock (checkbox)

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