BUILT-IN MATHEMATICA SYMBOL

$FrontEndSession

$FrontEndSession
is a global symbol that represents the current session of the front end from which the kernel is being run.

Details Details

You can use Options and SetOptions on $FrontEndSession to read and set global options for the current session of the front end.
Options set for $FrontEndSession override options set for $FrontEnd, but do not persist between front end sessions.

Make cell brackets thick for the current session:

Reset the brackets to their initial thickness:

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