All project pages suddenly shifted to the right!

Not sure what I did but all of a sudden all of my project pages got shifted to the right and on the left side started seen a grey area with vertical text saying “Desktop affects all resolutions”!!! To force it to become like before as a work around, I hade to go to the body of each page and forces its right margin to a value of 220 instead of 0. This is annoying. Any suggestions what to do? thanks

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