Indexing issue

Hello,   I have weird issue  I don't know  if it's intended feature or a bug 

but when I open new project  or do invalidate cache     phpstorm  indexes all  my project inside htdocs folder

when I was using old versions  it was only indexing the project file only not all my projects!!!

and this make the program very slow  and freeze too much

this issue happens on some of my project  I don't know the reason 

I updated it to version 2018.1  but didn't solve it.