What is "align selection" in arrange group?

@DavidRutten
Hi! I can’t find any application for “align selection” in arrange subcategory; It’s always grayed-out no matter what i selected! What’s the purpose behind that?

Screenshot 2021-10-15 175228

@DavidRutten

@DavidRutten

Hi everybody! Please send my regards and my question to @DavidRutten