Left menu

[mihran khan]

#category-list.custom_close .current-cat-parent .children, #category-list.custom_close .current-cat .children {
display: none;
}

Maybe something like this?

Nothing is changing if i do this

 

[Direct Webstore]

Nothing is changing if i do this

He said "MAYBE" something like this. Obviously, as it is, it won't work. You will need to change it and experiment. You need to inspect the elements in question and make modifications.