ASM Policy Differencial Enabled vs. Staging difference for Policy Signatures

Sidebar question to my original query regarding Policy A (Policy Signatures Disabled) vs. Policy B (Policy Signatures Enabled). If I take a specific attack signature, and I navigate via Security ›› Application Security : Attack Signatures. Lookup specific signature for Policy A, and it details ID, Learning, Staging (No), Learn, Alarm, Block, Enabled status. All good. However, when I attempt to lookup signature B, No entries found. If the Policy does not have the Signature, how can it be Enabled???

Thanks again.