The missing input fields are likely caused by interference from a handful of specific Chrome extensions.
To resolve this, would you please open your app editor in an incognito tab or in a different browser where you have no extensions installed?
If this resolves the missing input field for you, could you return to your usual Chrome browser and disable your extensions one-by-one to pinpoint the one that's interfering with the editor?
One specific extension that a few users have mentioned is "Méliuz: Cashback", so if you have that installed, that may be a good one to start with.