Use the gallery control's OptionsView.Item.Text.AlignHorz and/or OptionsView.Item.Text.AlignVert properties (introduced in VCL 13.1) to customize the alignment of the item text (caption and description).
TdxGalleryControl - Add the capability to customize the item caption alignment
Answers approved by DevExpress Support
We have implemented the functionality described in this ticket. It will be included in our next update(s).
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This property does not exist in the Ribbon gallery. Our TdxGalleryControl and Ribbon gallery are very different in fact. I have created a separate ticket to implement a similar feature for the Ribbon gallery, too (TdxRibbonGalleryItem - Add the capability to customize the item caption alignment).