导航菜单Menu在内嵌菜单模式下收缩成一列时，也能提示Title

[nnzbz]

• I have searched the issues of this repository and believe that this is not a duplicate.

What problem does this feature solve?

当前导航菜单Menu在内嵌菜单模式下收缩成一列时，如果没有子项，是有提示的，可是如果有子项就没有提示了。
这个时候只能看到子项，不知道本项是什么，用户只能靠猜，对用户不太友好，希望能改进这个小问题。
可以在左边或上方显示提示，右边展示子项，这样就不冲突了

What does the proposed API look like?

无

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