Answered
The image window doesn't snap to the border.

As shown in the GIF above, I can't neither expand the image window nor snap it to the other panel's border. Please advice the solution! Thank you.

As shown in the GIF above, I can't neither expand the image window nor snap it to the other panel's border. Please advice the solution! Thank you.
Perhaps you want to turn on the Application Frame under Window>Application Frame.

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