The bookmark panel of PDF-XChange Viewer when being focused has a yellow title bar:

However, it can only be focused when being clicked inside the red box. Clicking on other locations (title bar, buttons, scrolling handle, moving it around) doesn't make it focused at all:

Why is that? I suspect it has something related to the Window manager, but I don't know exactly why.

Related: How to focus a floating panel?

  • 2
    This is a result of using a non-standard window manager and not using the hooks and plugins offered by Microsoft for working with their own Window Manager. To learn why this is the case, and to solve the problem, you'll need to speak with the developer of that program. – music2myear Sep 17 at 17:20

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