Entries in the System Browser can be sorted in a number of ways. Choose Tools > Preferences... or click to display the System Browser Preferences dialog. Click on the General tab to view the sorting options.
Sorts entries in the main area of the current view (the graph in the graph view and the Files area in the text view) according to the symbol name.
Sorts entries in the main area according to their package.
Leave entries in the main area unsorted. This is the default setting.