What are these square white symbols in model history ?
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It shows that those features are inactive.
When you make any intermediate feature as 'Make Current Feature' or 'Edit with Rollback' then subsequent features becomes inactive. You can see it by selecting an inactive feature and displaying its information.
From Documentation (NX 10)
Part Navigator feature shortcut menu options
Regards,Ganesh#IngenuityisNX | NX Continuous Release F.A.Q | NX12.0.2 Measurement Commands Consolidation