If I have missed this somehow, apologies...
It would be very useful to be able to change the sorting when in Grid View, most likely by use of a new button perhaps? At the moment, I believe you have to change the view to List, pick your sort, and then return to Grid View.
As a person with a mild case of dyslexia, I usually tend to search visually rather than textually. Where this comes into play for me with the 'pedias is when I am updating my Wishlist and/or my "Ordered" Collection. In these smaller collections, it is much faster to search visually rather than perform a search to find the relevant titles.
*Pedia sorting in Grid View
Re: *Pedia sorting in Grid View
Thank you for the feedback. We had planned a sub menu item for sorting, like the old iTunes used to have. But found that it made cumbersome and stuck with clicking the header in the list view. I'll flag this post to look at when redesigning the Pedias to see if there is a solution to allow sorting in grid view.