I was seeing the same thing, however as Klaus pointed out I didn't have the underscores turned on in my Windows 10 settings. Once I turned them on, I could see them. One behavior that I find odd though (with or without the underscores turned on) is that in the B4A IDE, if I press & hold ALT-F, it doesn't work. I have to press & release ALT, then press F for the File menu to open. By contrast, if I press ALT-F in Windows File Manager, the File menu opens.
- Colin.