the welcome screen does not show the letters properly. it seems corrupted.
words like projects, getting started and the any other word is shown as if were missing the fonts used by unity graphic design!
how to solve it?
i found out what happens.
i am studying material design from google and i discovered that unity uses roboto font as material design does. i have all the roboto family installed on my computer and when i renamed the roboto font in unity system folder, the welcome screen rendered the words correctly.