TLDR: When any window in Windows OS loses focus after closing a dialog, the best method that works for me to get back to normal behavior is by killing the explorer.exe from the task manager. For safety, I keep the command prompt open so that I can reopen Windows Explorer again if it doesn’t reopen automatically. Just pass the explorer.exe command in the command prompt.
Quite a few times, I found while working in LabVIEW that when I open some dialogs like VI properties or LabVIEW Options and close those dialogs, focus is lost and my Ctrl+Space or Ctrl+W doesn’t work in the previous window I was working with. Initially, I thought it was due to some bug in LabVIEW, but later found that Windows Explorer is taking on some focus after closing any window. So killing the explorer worked.
Ajay is a professional developer and architect of NI-LabVIEW applications with extreme interest in getting the hardware connected to LabVIEW and automating the stuff. Recently he is also putting his hands in NI-TestStand to get very dirty on it. He is also a good mentor for the various interns in his career. He is ready to help the people in techie roles.