Hi @biebien alhurairah,
The AI generated answer is right. Left, center and right alignment are supported in Textbox control. Justify alignment is not supported. I suggest you raising a thread in this feedback portal https://feedbackportal.microsoft.com/feedback/forum/c23f3b77-f01b-ec11-b6e7-0022481f8472 for Excel. The Excel product team actively monitors user ideas there.
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