https://bugs.winehq.org/show_bug.cgi?id=56217
--- Comment #4 from C. Leu kle@bluewin.ch --- Thanks for the confirmation. I have changed the main title to reflect the problem regarding the non-closable "learning center" dialog box with built-in gdiplus.
Andy by the way. The following is a bit far-fetched but there exist an interesting Wine GitLab MR which resolves different "windowing bugs" under X11. It might probably make sense to take a look: https://gitlab.winehq.org/wine/wine/-/merge_requests/2343