If you first create the form in InDesign then you can open it in Adobe Acrobat Pro, go to tools>form fields, ctrl+click or right click the field you want to change, select properties from dropdown menu, then go to options and there will be an option for changing the text alignment.
If you first create the form in InDesign then you can open it in Adobe Acrobat Pro, go to tools>form fields, ctrl+click or right click the field you want to change, select properties from dropdown menu, then go to options and there will be an option for changing the text alignment.