Problem: How to build glossary (a to z) filter using view
Solution: To build view with glossary filter, you need two views. You should add A-Z character as taxonomy terms by creating new alphabet taxonomy to display the A-Z character filter. You need another view to display posts belongs to the character.
You can find proposed solution with the following reply: => https://toolset.com/forums/topic/filtering-artist-by-selecting-the-first-letter-of-the-title/#post-602852
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