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When I open Thunderbird on my Dell desktop, only the upper left corner (about 1.5 inches square) of the email display appears instead of a full screen. I have clicked on everything I can see but I can never get it to display a full screen. Is there something more I can do to get my full screen back?

When I open Thunderbird on my Dell desktop, only the upper left corner (about 1.5 inches square) of the email display appears instead of a full screen. I have clicked on everything I can see but I can never get it to display a full screen. Is there something more I can do to get my full screen back?

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Place the cursor on the lower right corner of the window until it turns into a double arrow, then click and drag to expand the size until the resize button in the upper right corner can be clicked.