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Hi HansFun and welcome.
Is the NEX-7 set to Autofocus Mode?
Peaking does not work in AF Mode. If you select Manual Focus - MF or DMF - you can enable and select Peaking Levels.
OK, now I understand. I have to select MF or DMF in the menu system!. I had selected MF with the AF/MF button (in remain position), but now I see that this is automaticly changed to AF as soon as I press the Menu button.