How do I disable Touch ID on my iPad

Disable for what purpose - everything, or just for specific functions?

If you wish to completely disable all TouchID functions, simply remove all registered fingerprints from Settings:

Settings > TouchID & Password > [Fingerprints] - tap/select a fingerprint “, then select Delete Fingerprint

Repeat for each registered Fingerprint.

If instead you wish to disable a specific TouchID integration, they can be enabled or disabled:

Settings > TouchID & Password

Go to Settings > Touch ID & Passcode > Enter your Passcode> turn off the settings that you do not want to use anymore under > Use Touch ID for

Remove fingerprints if necessary