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It is best practice to manage dgnlib files outside the day to day working environment. One method is by using an administrator User Configuration file containing appropriate variables.
An essential variable to add to such a UCF for AECOsim Building Designer is:
BB_DVDATASETELEMENTS =
This sets the variable to a null value and will disable the copying of dataset library content, levels, linestyles, etc., into the dgnlib when you are working on it.
AECOsim Building Designer copies levels and linestyles needed for Dynamic View creation into each file on open. These are required for DV operations but are neither needed or wanted in dgnlibs other than the source dgnlibs in the dataset.
Unwanted content can be compressed out of dgnlib files by careful use of the key-in "delete unused" with options as appropriate, eg "delete unused linestyles".
Obviously you should not use this example command in a dgnlib that actually contains your library linestyles!
Search help using the string "delete unused" for all options for the 'delete unused' key-in.