Responsiveness doesn't work at all

My app is totally fixed in position, and when I click “Responsive” I don’t have the ability to click on alternate sizes or to resize sliding the element in the menu.

What setting do I have configured wrong? This must be something really basic but I can’t figure it out.

Thanks

If your page is fixed then it is not responsive at all.
To make your page responsive you need to set the layout to Align to Parent, Row, or Column.

Check here for more information.

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Thank you very much!