VMG1312-B30A cannot add another time frame in Parental Control Profile


I am trying to add another time frame/bar in a Parental Control Profile. According to the manual, up to 3 time bars are allowed and can be added with clicking the plus icon:

Unfortunately, I can't see this plus icon in my profile:

I would like to add more than one timeframe, does anyone know why the plus is missing`?


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