In iOS 11, Apple added a feature to quickly disable fingerprint and face logins. Unfortunately, it only works on iPhones; if you use the fingerprint reader on an iPad, the only way to disable it is to shut the device off.
I haven’t tested this in iOS 12 yet, because I need my devices to work, so I don’t upgrade them until at least the first patch release, usually the third. Because x.0 releases from Apple have been a disaster for many, many years.
In fairness to their many hardware problems, everyone’s dot-oh hardware releases are dubious. You learn an awful lot while that first batch of devices is crossing the Pacific on a container ship. This is why the best way to get a reliable product from Apple is to buy their factory-refurbished units that are extensively tested and eligible for AppleCare.
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Sometimes you have to double-click to enter text in the form (interaction between Isso and Bootstrap?). Tab is more reliable.