If you have a tab containing the Schema Vizualisation and select or create another tab (for exemple the content of a table), when going back to the Schema Visualization tab it appears blank and you have to generated it again (Database + Manage + Schema Visualization), losing the zoom and pan settings you had.
If you have a tab containing the Schema Vizualisation and select or create another tab (for exemple the content of a table), when going back to the Schema Visualization tab it appears blank and you have to generated it again (Database + Manage + Schema Visualization), losing the zoom and pan settings you had.