How do I enter developer mode on my OnePlus Nord N10 5G?

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Android Central Question

I tried to enable developer options on my OnePlus Nord N10 5G running Android 11, but the build number is greyed out. I've never encountered this before. Any suggestions?
 
Does it have an Oxygen OS Version box and line in About Phone?
If I tap several times on the line "MIUI Version xxx" on both my Xiaomi phones that brings up Developer Options.