Yes, that is what we call them. Literally because they're used to create levels from the dataset (Family + Part in this case). If you open the Compress options dialog you can uncheck everything but the Dataset Elements option. And yes, when set to 0 the scan process is disabled. And no... In order for live resymbolization to take place the levels must exist first - that's why we scan DGN files when opened, so they're ready if and when needed. Perhaps some day we'll have a more "on demand" implementation for this.
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