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SQL Developer: Tools -> Preferences -> Database -> Object Viewer

Settings that can be modified under Tools -> Preferences -> Database -> Object Viewer include
Options that relate to the Data Editor include
This menu also allows to clear persisted table column widths, column order, highlights and filter settings.

Open Objects on Single Click

It is generally recommended to un-set Open Objects on Single Click.
With this setting, trying to generate an ERD is almost a nightmare.
The value of this setting is stored in the product-preferences.xml file under the value of OPEN_ON_SINGLE_CLICK.

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