What does the green bar on the VisualStudio icon mean? - visual-studio

Visual Studio 2019.
I created a project.
I launched an otldaku.
After the debugging, a green line remained on the VisualStudio icon.
Question:
1. What does the green bar on the VisualStudio icon mean?
2. How to make this strip disappear?
Update - 1

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Theme: Dark

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