How can i contribute as a designer?

Hi @Irene if you are interested in Outreachy please see here: Welcome Outreachy Applicants - Spring 2024 for how to get started. The issues queue is here: Issues · odk-x/tool-suite-X · GitHub and the board you linked to is the UI project board, but these are not the only issues to work on, and if you want to work on an issue other than the Outreachy starter ones, please ask to be assigned to it.