Dual UOM for Process and Discrete Manufcaturing

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Hello Friends,

We are defining Items with dual UOM for Make Items. We are using mixed mode (discrete and Process Mfg) in a single Org.

Two question I have:

1. For discrete from 21 C looks like by default dual UOM is enabled and does not show in Opt-In feature. How do I disable this default feature, I do not want to have dual UOM for discrete mfg?
2. For Process Mfg, Initially I have opted-in to have dual UOM feature to enable. Now i have disabled the dual UOM for Process Mfg but still for new work order still appears to be enabled dual UOM feature. How do I disable the feature of dual UOM for Process Mfg?