Can you try "set cli screen-length <no>" and check?
i.e
root@mx> set cli screen-length 10
Screen length set to 10
root@mx> show configuration
## Last commit: 2017-11-07 15:43:45 UTC by root
version 15.1F6-S6.4;
groups {
test{
dynamic-profiles {
DHCP-USER {
predefined-variable-defaults {
cos-scheduler-tx rate 10m;
input-filter user-in-10m;
---(more)---
HTH