if you just want to know how many lines in the current file :
in windwos ,you can use ctrl+end
(if you use laptop ,you could use the Fn+Ctrl+left instead)
![在这里插入图片描述]()
use a professional plugin:
statistic :
![在这里插入图片描述]()
statistic the project:
![在这里插入图片描述]()
click the statistic window,the refresh:
![在这里插入图片描述]()