Hi Dave,
Unfortunately, there is not a way to enable Right-Click Context Menu in Kiosk Mode.
What’s more,
Ctrl+Esc to Open the Start screen even Windows logo key itself have been blocked in Kisok Mode.
Lets’ check the Kiosk Mode’s original intention:
Kiosk mode device signs in automatically and only runs one Microsoft Store app in full screen inside a restricted local user account (above the Lock screen) that prevents anyone from accessing the desktop, switch apps, or change settings.
Obviously, Right-Click Context Menu and Scan for Threats related to change settings.
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