Layout problem with SDDM

Recently I want to change layout in SDDM to English through local.conf in /etc/.
This change language, but don’t change layout in SDDM.
Then I try change local file in /etc/default/, but this doesn’t solve problem.
So, what other ways are there to do this?

You might find this link helpful:

For more information, visit SDDM’s archwiki page.

…and also

This link may also be helpful

Doesn’t work suddenly.

If you want help, post how exactly have you tried to “make it work”, so we can advise further.
Have you read the previously posted links articles?