I have a list of todo items with 6 properties of which 4 are sortable. The type (icon), the tags, the stars and date are sortable by clicking on them. Name and description are not sortable (no added value). I'm thinking if in the look below it's sufficiently clear to users that they can click, for example on the icon, to sort the elements according to the icon.
The classic way to solve this would be by including a 'sort bar' with carets to indicate ascending - descending sorting.
But I don't like this. It just looks like unnecessary clutter to me, makes it messier and attacks the visual unity while the functionality can be achieved without this. I'm feeling people would like to see this sort bar included but I'd like some suggestions on how to make it clear to users that elements are sortable by clicking on them. Without the sort bar. Any other recommendations are also welcome. Thank you.