Canon EOS M Basic Instruction Manual page 267

By selecting [zDefault set.] in step 5, you can revert the respective
Picture Style to its default parameter settings.
To shoot with the Picture Style you modified, follow step 3 on page 114 to
select the modified Picture Style and then shoot.
Q A Adjusting the Picture StyleN
Set the parameter.
5
Tap [Y]/[Z] to set the parameter,
then tap [2].
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