How to set align of imegedata ?? (FM to XML)

I used structured framemaker.

I saved the book file as XML.

In XML file, And I look at the tag, the alignment value for the image has been entered. (align="acenter")

Where can I modify this value? I want to set the align value.

I checked the attribute values of the elements, but there was no connection.

I checked the attribute values of the element, but there was not relevant.

<ImageData entity="ImageData1" impsize="5.421in 3.955in"
impby="ref" sideways="0" impang="0.000" xoffset="0.000in"
yoffset="0.014in" position="inline" align="acenter"
cropped="0" float="0" width="5.449in" height="3.983in"
angle="0.000" bloffset="0.000in" nsoffset="0.000in"/>