Old layout Server Version 5.2

How to enable the old revision look 5.2?

There's a button in the top-right corner of the login screen.

Is it impossible to switch to the old look in v5.3?

Yes, you need to change it in the config file.

I can not see it. How to change it?

https://www.traccar.org/configuration-file/

https://www.traccar.org/forums/topic/web-app-selection-in-traccar-53/