I left my computer on last night and when I came back this morning, my trays were gone. I was using Tray 1. Now I can only get Default to appear although Tray 1 is still in the Window dropdown. Can someone tell me what I did?
Perhaps if you click or maybe double click the Tray 1 icon bottom left of your screen it may come back.
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This is the option, “Be careful of the planet! Don’t leave your computer on for nothing all night!” Next time, I’ll delete everything! 
Thanks.