[Povratnik]

Or more precisely, about colours related to friends.

Circles that resemble traffic lights could be red, yellow and green. I guess - red means they're offline; yellow means they are playing; green means they're online and idle.
Is that all? Lets say - I follow two players and one of them also follows me, while the other doesn't. Shall I see them differently?

Rectangular flat buttons could have several different colours. How many different colours exist and what each of the colours means?

[barmar]

You're correct about the traffic lights. It's meant to indicate whether you can invite them to play with you.

Players that you follow have a grey button, players that follow you back have a blue button, and players you ignore have a black button.

[Povratnik]

Thanks for information. Have to say that the solution is very subtle. The blue and blue-grey buttons look as mildly different nuances of the same colour and yet are distinctive enough. Greater similarity, as well as greater dissimilarity, would be less elegant. Whoever made the precise choice - has considerable talent.

[barmar]

Color isn't the only thing. Friends are at the top of the list, people you're following are at the bottom.

[Povratnik]

Very nice feature, I'd like to have it. Where I can set my list that way?

Currently, the list is ordered alphabetically and looks this way (from the top):
BLUE, grey, grey, BLUE, BLUE, BLUE, grey, ...

[barmar]

Povratnik, on 2020-April-08, 06:08, said:

Very nice feature, I'd like to have it. Where I can set my list that way?

Currently, the list is ordered alphabetically and looks this way (from the top):
BLUE, grey, grey, BLUE, BLUE, BLUE, grey, ...

I'm not sure why it's not working for you. I tried the web version and both the android and ios apps, and they all ordered them as I said.

[Povratnik]

See my signature
I'm a XX century beast, still using a PC...

[smerriman]

Seems like it only puts friends first if you have 'Show offline' disabled.

[Povratnik]

I see. Well, that should be corrected, but it's not urgent at all...
Thanks for all information.

[barmar]

Povratnik, on 2020-April-09, 13:02, said:

See my signature
I'm a XX century beast, still using a PC...

The web version is the same on all devices.

[barmar]

Povratnik, on 2020-April-09, 19:22, said:

I see. Well, that should be corrected, but it's not urgent at all...
Thanks for all information.

This is deliberate. When you show all, it's simply alphabetical.

[Povratnik]

I see. To me, order of friends is irrelevant, if I see only those ones that are logged in. Various orderings are interesting only when I see them all (because the list is much longer).
But users with huge number of friends have different needs and system is (rightfully) designed for them. I have no complains.