Ive click a dpi custom...and i cant return it

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please help me.... ive turn my dpi into a custom setting which is 160 now i cant return it into fixed dpi which is 120 i cant return it beacause it has a big text box and i couldnt click the advance .., how can i return it please ,,,, asap .. thanki you very much...and it also said "dsub"...

 

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and its very big for my screen that's why the advance didnt show,