Understanding, How X and Y is selected in the Floating View extension

How to select X and Y in floating view extension so that the overlay appear perfectly at the middle

Which floating view extension ? Please provide a link and documentation ?

This one, I am a kodular user btw

This is the App Inventor community. If you are developing with Kodular, you should ask your questions there, the requirements may be different.

That said, if you read the posts in the topic, you will get your answer @ post #80