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Hi,
Currently, there is no way to reorder filter items alphabetically or in any other way. These items are added automatically based on the order in your image sets. For example, if you have this image gallery structure:
– Image 1
— Cat 2
— Cat 1
– Image 2
— Cat 3
The filter will display categories in this order: Cat 2 | Cat 1 | Cat 3
Regards,
Nikita.