hi i'm using the Categories widget show hierarchy. I leave the space for title because I don't need to show any title. but it then displays on the website as "Categories". how can I remove that?
There is a filter you can use to do this. (Kruti has even found it, but instead of using it, he modified core files...)
So what you really need to do, is to add this to your functions.php:
add_filter for widget_title does not allow more than one parameter when called so the above will throw PHP warnings.
This seems to work instead:
(tried to add this as a Comment to Krzysiek Dróżdż but don't have enough rep to do so)