I have tried to disable it under Settings > Keyboard > Shortcuts > Navigation > Hide all normal windows. It appears disabled there, but if I hit Ctrl + Alt + D all windows will still minimize. My next step was to try and use dconf-editor to disable it under org.
Thank you for your feedback.
However, we have confirmed that it is impossible to disable the hotkey for real-time drawing function by using Regedit.exe.
Hopefully our development team will consider it in the future versions of Bandicam.