As shown in the attached picture, there are two split windows in the picture. The one on the right appears when taglist is opened.
I specially added set nu for comparison.
What is the gray-white vertical bar on the far left side of the taglist window and how to control it?
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那个叫做 sign column，你可以在 vim 里面看看帮助详细了解它
:help signs想要去掉它，我想最简单的办法应该是：
:sign unplace *，试试看。