Within the Admin (CSP) under Data -> Tags, you will find all tags associated with your products for each catalog. Tags within Elastic will also show as filters for users on the front end of the site. Using the tags section you can choose the order they will show and turn filters on or off for the tags by checking or unchecking the Filter box. This can be done at the Tag Name (Parent) or Tag Value (child) for each tag.
If no position is set or the position number in admin is the same they will sort alphabetically. Using the above example you will see the filters for this catalog show with the lowest sort position first (top to bottom).