In the Zoho Email Tasks App, I can't organize the task categories.

In the Zoho Email Tasks App, I can't organize the task categories.

Hi! 

I did a search and couldn't find anyone else who had this issue so I'm really hoping that I'm just missing the boat a little. I have created several categories for my tasks but I cannot re-order them in any way. They seem to permanently be in the order that I added them. I've tried finding a button to sort them (they could at least be alphabetical, right?), drag and drop, and even checking the settings. I even tried different browsers. Is there a way to re-sort the category names? 

Thanks! 
Teresa