When the same document is opened in two or more windows, clicking on one window updates the displayed zoom level text in the zoom widget in all windows associated with that document, despite the fact that the zoom level didn't change in other windows. It seems that this value is being updated from a global variable linked to the document. This field/widget should be updated for each window individually. See attached screenshot.

Tested on Adobe Acrobat (64-bit) (25.001.20531) - Brazilian Portuguese, on Windows 10 Pro - Brazilian Portuguese.