I’ve been annoyed not having mouse support in Windows 10 OSD, TS Fails, I hit F8, then it’s all trying to navigate with keyboard commands. I finally ran across a fix to enable mouse support during this stage of OSD.
Thanks MDT Facebook group for this, and a Dell Engineer Elliot who pointed me to a Dell white paper HERE
Now when I open F8 / CMTrace, I have mouse control!
Note: The mouse does NOT show up in the black areas of the setup screen, it has to be over a application window (CMD, Notepad, CMtrace, etc). Once you move it outside of the window, it disappears again until you wiggle it back above a window. Recommend maximize your active window.