Once you choose a Single Part symbol, Unit dropdown selector should be greyed/disabled.
And once you choose a multi part component, the dropdown list should be instantly enabled, with the correct multi parts informations loaded, and one default unit selected.
Plus, reverting to a single part symbol should not mess with units...
In my opinion, this is how it should behave:
Once you choose a Single Part symbol, Unit dropdown selector should be greyed/disabled.
And once you choose a multi part component, the dropdown list should be instantly enabled, with the correct multi parts informations loaded, and one default unit selected.
Plus, reverting to a single part symbol should not mess with units...
Thank you.