A) Open one file from the package
shortcuts:
Ctrl + Click on unit name or
Ctrl + Enter with caret on unit name
Double click a file name in the package editor
B) Search > Find in Files then Where > [X] Directories (checked) shortcuts:
Ctrl + Shift + F
... and the directory will be filled in using the current file directory, which should be your package source.
Enter a search phrase, press Find and you are now searching the package source code files.
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