Sorting Attribute Values

Hi there! How can I sort the values of the attribute when it is displayed in the filter module?

What I currently see:
Size
 Medium
 Large
 Small

I would like to reorder as such:
Size
 Small
 Medium
 Large

Another example:
Current:
Category
 Group 3
 Group 1
 Group 2
 Group 4 (featured)

To make it like this:
Category
 Group 4 (featured)
 Group 3
 Group 2
 Group 1


Awaiting your advice. Thank you!
Using Eshop 4.0.2

Hello bumble,

Thank you for submitting the ticket here. Please go to the back-end of your site:

1. Go to EShop -> Catalog -> Options to edit Size options and enter the ordering of option values as you want. Value is 1, 2 and 3.

2. Go to EShop -> System -> Configuration -> Sorting tab, at "Option Value Sorting", choose "Option Value Ordering (Low > High)", then Save the Configuration and test again.

I hope this is useful.

Sincerely, Giang