You can disable hike Keyboard Temporarily or Permanently.
To switch to System keyboard Temporarily
Step 1: Tap on the "Three dot menu" in the Chat thread.
Step 2: Select "System Keyboard"
To disable hike keyboard Permanently
Step 1: Select "Settings" from the 'Three dot menu' in the home screen.
Step 2: Select 'Language & Input'
Step 3: Swipe left the 'Hike Keyboard' under 'Keyboard Settings'