https://superuser.com/a/1734901
To use Win+V for toggling CopyQ on Windows 10, there is a Registry Key specifically to disable this feature.
Open Regedit
Navigate to Computer\HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Clipboard
Set IsCloudAndHistoryFeatureAvailable
to 0. If this key isn't there,
create a DWORD with the name IsCloudAndHistoryFeatureAvailable and set it to 0.
This also removes the clipboard menu from Windows Settings which only contains settings for this feature. You have to restart explorer.exe or reboot for the Win+V popup to stop appearing. Start > Settings > System > Clipboard disappears when a new Settings window is opened, which confused me.