By default, htop shows many more processes than other tools (top, ps). The solution is to press H, as mentionned in Why are there many processes listed under the same title in htop?, to get the "usual" shorter process list.
With which command-line argument should we run htop, to have this behaviour?
There is no command-line option in htop to do this, not even an undocumented option.
As noted by Kamil Maciorowski, if you start htop once, toggle the display of threads (H), and exit, the setting is stored in htop’s configuration file and subsequent htop invocations will use the same setting. The configuration file is $XDG_CONFIG_HOME/htop/htoprc (~/.config/htop/htoprc); writing hide_userland_threads=0 there before the first execution of htop will achieve the desired effect.
htopsaves its config in~/.config/htop/htoprcand the state ofHis there ashide_userland_threads=1orhide_userland_threads=0. No matter whathtopshows "by default", it's enough to configure it once and the setting will be saved. Doesn't yourhtopsave the setting?.toprcthat I copy around for the same reason. Once you have enough such utilities and custom configurations, it makes more sense to copy the config files around instead of random command-line arguments