Hi again Joe:
Referring back to my original post, the SYSTEM ID as shown on the ISPF main screen is correct without setting &SID in JES2PARM.
Where it is not correct is on the welcome message as shown:
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On Sun, 2024-04-28 at 11:29 -0500, Joe Monk wrote:

Changing SID parameter in SMF and JES:
After RE-IPL and SPOOL Format...
Joe
On Sun, Apr 28, 2024 at 10:42?AM Daniel L. Srebnick via <dan=
[email protected]> wrote:
Joe:
I did already try this on an earlier iteration, including reformatting the spool.
On my TK5 Update 3 system, it is in SYS1.JES2PARM(JES2PARM).
It did not have the desired effect.
On Sun, 2024-04-28 at 10:22 -0500, Joe Monk wrote:
So, in JES2 parms in SYS1.PARMLIB, you may see this parameter:
Joe