Unfortunately like every other Chinese gacha game it's not possible to remove the ID in left down corner of the screen in WWM.

Maybe Later?

Some people have contacted WWM support for possible option to delete the ID and they've said that they pitched the idea to the developers.

Dear Player,

Thank you for your feedback and suggestion!

We appreciate your concern regarding the visibility of the ID number on OLED monitors. We understand that prolonged display of static elements can be harmful. Your idea to add an option for hiding the ID number, particularly in Immersive mode, is valuable, and we will pass it along to our development team for consideration.

We're glad to hear that you're enjoying the game! If you have any more suggestions or questions, please feel free to reach out. We'd appreciate it if you could be considerate and evaluate our service. Thank you. Wish you a good day!

Best regards,
Support Team

[https://steamcommunity.com/app/3564740/discussions/0/684111928012837489/#c685238092472254772]