Samsung
Change Always On Display Clock Style auf Samsung
The Always On Display keeps a reduced version of your lock screen visible while the phone stays locked, and the clock shown there is controlled separately from the clock on your regular lock screen.
By default, Samsung shows a plain digital clock, but the Clock style menu inside One UI holds several analog and digital layouts, individual color options and an optional calendar line placed under the time.
To switch it, open Tap on Settings ➔ Tap on Lock screen ➔ Tap on Always On Display ➔ Tap on Clock style ➔ Set the Clock style and change the Color ➔ Tap on Done.
A lighter clock color can be harder to read outdoors in bright sun, while darker or muted tones tend to save more battery on an OLED panel since fewer pixels light up.
If the Clock style option is greyed out or the whole preview stays blank, check first whether Always On Display itself is switched on in the same Lock screen menu before troubleshooting the clock design.
An analog face combined with a busy background image can reduce legibility at night, so test any new style under both dim and bright conditions before keeping it.