Endevor's left / right schrolling (PF10 / PF11) does not work correctly.
The problem can be due to the user's ISPF profile data set that is being used by Endevor having an old version in the CSIQTENU command table, member CTLICMDS.
Or missing a PASSLIB command on the clist bringing up Endevor can also cause this problem.
The following commands can be manually added to your command table through the TSO ISPF option 3.9 (Application ID:CTLI) or you can copy this table from the Endevor table library: library (dataset iprefix.iqual.CSIQTENU member CTLICMDS).
This table was updated to include 2 entries for controlling the LEFT or RIGHT command when entered from the command line (normally by hitting PF10 or PF11).
These are the commands:
VERB T Action
LEFT 4 &VARC1LR
RIGHT 5 &VARC1LR
Another cause for the left / right schrolling error can occur if the clist that brings up Endevor does not have the word PASSLIB -
"ISPEXEC SELECT PGM(C1SM1000) NOCHECK NEWAPPL(CTLI) PASSLIB"