The Sentinel Toolbox Help Menu contains:

Help Topics
Opens the Sentinel Toolbox help.
Context search
Google search context
STEP Home Page
Opens the STEP web site: https://http://step.esa.int
Report an issue
Directs to a web page where it is explained how you can report issues: https://step.esa.int/main/community/issue-reporting/
Tutorials
Open the tutorials page on the step web site: https://step.esa.int/main/doc/tutorials/
Show Log Directory
Opens the file browser with the location of the log files SNAP generates. This is useful to inspect the possible cause of errors and for issue reporting.
Check for Updates
Checks if new updates are available for the installed modules.
About SNAP
Opens the 'About SNAP' window.