Multiple checkboxes

[JohnTiger1]

Hi, please add a checkbox that is disabled by default, on the top left, which says: "Allow multiple selection of categories/states/tags", then instead of being able to choose only one category for example one can choose to filter by many categories/states/tags.
What do you think?

[Peter]

Please post this on Github so the devs can see it.
(I am not sure how hard it would be to implement this.)