RowAlignments
is an option for the low-level function GridBox that specifies how entries in each row should be aligned.
Details

Examples
Wolfram Research (1996), RowAlignments, Wolfram Language function, https://reference.wolfram.com/language/ref/RowAlignments.html.
Text
Wolfram Research (1996), RowAlignments, Wolfram Language function, https://reference.wolfram.com/language/ref/RowAlignments.html.
CMS
Wolfram Language. 1996. "RowAlignments." Wolfram Language & System Documentation Center. Wolfram Research. https://reference.wolfram.com/language/ref/RowAlignments.html.
APA
Wolfram Language. (1996). RowAlignments. Wolfram Language & System Documentation Center. Retrieved from https://reference.wolfram.com/language/ref/RowAlignments.html