In the taskbar at the bottom of the windows screen, zotero stays red and always on

In the taskbar at the bottom of the windows screen, zotero stays always lit in red. After clicking on the icon and opening zotero on the first side, the icon remains red and does not disappear. What is causing this and how can I fix it?
https://s3.amazonaws.com/zotero.org/images/forums/u6870098/wekbxclruasdapij7bhj.png
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