I don't know if it's because of the Windows version or not having installed Google Chrome browser.
I can be certain that this library cannot achieve borderless effects in both the Win10 v19045 native system and the Win11 23h2 system in internet cafes.
The presentation effect is similar to : #576 (comment)
The library version I am using is : #define WEBUI_VERSION "2.5.0-beta.4"