Steps to reproduce the issue:

Open a PDF in Adobe Acrobat Reader.

Select “Fit two pages side by side within the window.”

Navigate to any spread with content on both left and right pages.

Attempt to add a comment by selecting some texts and clicking the comment button (should be the first button in the popup tool bar when u select something) while on the right-side page of the spread.

Environment:

Application: Adobe Acrobat Reader

Version: 25.1

OS: Windows 11

Expected result:
Clicking the comment button should open the comment box on both left and right pages.

Observed result:
The comment box does not appear when clicking the comment button on the right-side page in this viewing mode.
Commenting works correctly on the left-side page.

Video Demo: https://youtu.be/mUbajD95NMQ