Some of these lenses has quite long threads for the focusing that can result in heavy feel or drag when focusing.
Use a thinner, lighter grease for such lenses, after completely removing the old grease.

Remember to use JIS type screwdrivers for those hard to remove screws. And heat first to weaken the screw locking often used by Nikon when assembling the lenses.

The inner helicoid has quite wide groves whereas the central helicoid is quite tight - given the bulk of the weight is at hte front, supported by the inner helicoid, its ok to add more than just a thin coat of NLGI #00 grease there.  I gave it a very light coat and its a touch light in the focus action.

"Loes de poes"

She was visited by a tick so dressed up to prevent her from scratching.

Zf  Viltrox 55mm f/1.8, cropped

The "People" setting is found in "AF Area mode" setting.

On Z7ii I enter this AF-area mode selection by pressing the "i" button at the back of the camera. I guess it could also be found in the menu?

Got it.

The "AF Area mode" is probably in the Photo Shooting and Video Recording Menus. The detection type, people, animals, birds, etc. is in a sub-menu to the AF Area modes. I think I'm telling myself.

I use the "i" button as you do.

After using the AF-ON Only with AF-C for a few hour I've never gone back. It's press to focus, release to lock or press and hold for continuous focus.

Dave

Ok, my a1 setting is set to Focus and the a6 (AF activation) is set to Shutter/AF-ON. I may try the other setting.
The "People" setting is found in "AF Area mode" setting. There you can select in which way all the AF-point shall be used. E.g. if you want to select each AF-point manually by using the "arrows" (up-down, left-right) to select the AF point where the camera will focus or a mode can be selected where the camera tries to be intelligent to lock on people. If the camera can see two eyes it will try to lock on the eyes. There is also an Animal mode. On Z7ii I enter this AF-area mode selection by pressing the "i" button at the back of the camera. I guess it could also be found in the menu?

Edit:
Nikon has documented the AF-mode area settings here:
https://onlinemanual.nikonimglib.com/z7II_z6II/en/05_basic_settings_01.html

After the rain - Leica Q2 - Summilux 28mm f/1.7 @ ISO 400; 1/60s; f/8.0