When the new UI was added to the world menu in Bedrock, the ability to change the worlds name color with § stopped working.
To reproduce:
Open your world selection menu
Edit your world
Select the name of your world
Hold down alt while clicking 0167 on the keypad with num lock on (or paste from the internet) to type the § symbol
Type one of the supported formatting characters https://minecraft.fandom.com/wiki/Formatting_codes
Expected Result: A color change in the font
Actual Result: Shows '§' and the formatting character as part of the name
This is working as intended, see MCPE-174371.