Uninstalling any of the ObX components is pretty straightforward.
Go to the installation path of the specific components (for example: C:\ObX\Database, the default path for ObX historian)
Run the uninstall.exe
Wait for it to finish.
Uninstalling ObX Component
Uninstalling components of ObX will delete all databases, folders, and all items related to that component, so make sure you uninstall components that do not affect your system.