Hi @SSRS-VS ,
As far as I know, it is not possible to set the text in the columns of the mobile report to be centered.
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I suggest you submit the requirement at https://feedback.azure.com/forums/908035-sql-server.
If the requirement mentioned by customers for many times, the product team may consider to add this feature in the next SQL Server version. Your feedback is valuable for us to improve our products and increase the level of service provided.