I am not sure the best way with Glitch… On a local development you would:
A) npm uninstall helmet, then npm install --save-exact helmet@3.21.3
B) Edit the package.json directly, then npm install to update the app and dependencies.
Thanks @hay and @Sky020 it did work after refreshing and all. It is so weird I have been copying the live app url. It’s really amazing being part of this helpful community.