We are sorry to hear you are having trouble with the Align center horizontally keyboard shortcut not working for you. We would like to know a few more details like-
Have you tried to align them using the icons in property inspector as in screenshot below?
Please share the screenshot of your about XD info page and system information.
I will try my best to address the issue.
Glad to hear that. Please feel free to reach out to us in the future for any query related to XD.
We are here to help.