The look and feel of the SQL developer is the visual characteristics of the tool, which again can be customized as per our needs. To do this, go to Tools | Preferences | Environment:

The preceding screenshot shows the Environment node under Tools | Preferences and the options that you can enable for external files and its dynamic actions on SQL Developer startup. Look and feel has Oracle and Windows options; any change made will prompt for a SQL Developer restart for the changes to reflect.

Once the SQL developer is restarted, the environment's look and feel completely changes like a windows screen, as shown in the following screenshot:

The Environment node also has two other options, Local History and Log.

Local History controls the number of days to keep the file history and number of revisions per file:

The Log option enables us to set the required colors for the logs such as hyperlink, program output, error, and input colors: