I'm not sure if this is a good change, as we lower the security. However, I'm not that confident with this cookie option and don't feel like overseeing all the implications.
How about a middle ground: don't change it in general, but add it to webserver.headers (defaulting to 'strict') giving users the ability to change it themselves?

I don't think there will be any issues using Lax.

Lax is the default value for this option. It is automatically set by browsers if SameSite is not present).

Using it will allow to users to use direct links to inner pages (we want the authentication cookie to be sent in this case, to avoid the login page).

I tend towards the "Lax is fine", the more reading I'm doing on this. See also a very similar discussion elsewhere: gofiber/fiber#1639

Rebased on latest development and marked as ready to go.

@yubiuser what do you say? I'm not going to merge this against your objections if they still hold, I can understand it but I, personally, think it's fine. I have not been thinking long enough possible implications when I wrote this initially. @rdwebdesign is right that this is a breaking change because PHP is doing what we want to do in this PR as default

If the two of you are good with the change I don't have objections. Esp. when

Lax is the default value for this option

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Did you consider my suggestion

How about a middle ground: don't change it in general, but add it to webserver.headers (defaulting to 'strict') giving users the ability to change it themselves?

If you think we should allow users to freely set this option, personally I think we should set Lax and allow users to set as Strict or even SameSite=None; Secure.

Sorry, I did not see the two comments thus far. I don't think an option is useful here, it's rather unlikely that any user will really change it.

Yeah... I don't think we need another option here.

This pull request has been mentioned on Pi-hole Userspace. There might be relevant details there:

https://discourse.pi-hole.net/t/pi-hole-ftl-v6-2-3-released/80593/1