You don’t have to - I use to create a minimal ISO - which is not your type of install.
See the [root tip] [How To] Mini guide to build Manjaro ISO.
This is how the ISOs are build - the optional -f tells the script to use the full profile
buildiso -p <profile> -b <branch> -k <kernel> [-f]
For a full ISO, using stable branch, using LTS kernel, and plasma desktop
buildiso -p kde -b stable -k linux618 -f
If you want the latest stable kernel as of 2026-07-08T22:00:00Z simply replace the -k <kernel>
buildiso -p kde -b stable -k linux71 -f