XYplorer Beta Club

Open any .xlsx file and press CTRL+F.
Open any version of XY and press CTRL+F => Preview.
Next, browse the files in XY; when switching from one .xlsx file to the next or previous one, the focus automatically shifts from the XY window to the .xlsx file.
In the movie, the name of the open .xlsx file and the name of the .xlsx file being viewed in XY are different.
Also, this looks like the old lines in LNG files:
Show hidden files and folders = OFF
Show hidden files and folders = OFF
Show junctions = OFF
Show junctions = OFF
Show Network folder = OFF
Show Network folder = OFF
Show Recycle Bin folder = OFF
Show Recycle Bin folder = OFF
Show system files and folders = OFF
Show system files and folders = OFF

What is this about? What's the problem?

I don't know what the problem is, but if you do everything I described above, then after quickly viewing an .xlsx file in XYplorer and switching to another file located next to the .xlsx file, the focus automatically shifts from the XYplorer window to the Excel window, where another .xlsx file is open and the CTRL+F shortcut has been pressed.
To reiterate: the focus spontaneously shifts from XYplorer to Excel.
Follow the steps exactly as I described above:
Open any .xlsx file in Excel and press CTRL+F there.
Open any version of XY, press CTRL+F, and switch to the “Preview” tab.
Then browse the .xlsx file in XYplorer. When switching from one .xlsx file to the next or to any previous file (not .xlsx), the focus automatically shifts from the XYplorer window to the Excel window where another .xlsx file is open. In other words, XYplorer automatically loses focus when previewing .xlsx files and navigating to the next or previous file (of any type). Watch the video above carefully.

MS Office is strange. At the moment, I can't give this observation any priority.