How to change lock screen clock display on Samsung Galaxy A3?

On the lock screen of a Samsung Galaxy A3, the clock is displayed in two rows: 14 18 I'd like it to be displayed as God intended: 14:18 And I've spent an hour trying to get it this way, and nothing helps. There's nothing in the Settings to customize the display of the clock. There are apps that are clock widgets, but they can be enabled only for the "home" screen, once the device is unlocked, not for the Lock screen. How can I change the display of the lock screen clock? Android version 7.0, Samsung Experience version 8.1.