You can cycle through UI visibility settings with F10. The three settings are a 'normal' view (where custom transparency/opacity settings are used for the windows), a 'full on' type of view (where no custom transparency/opacity settings are used, and all windows are completely visible), and a 'no UI' view (where the UI is disabled and you only will see the game/world graphics.
By switching through these, you should be able to reset the transparency/opacity on your window.
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