KNIME preferences doesn’t detect Path to the Python 3 start script when Anaconda is not installed.
Create a virtual (.venv) environment with Python and depdencies.
Set KNIME->Preferences->Conda to point to mambaforge
Set KNIME->Preferences->Python(Labs) to point to python.exe in .venv
Anaconda appears to be hard-wired into KNIME - though I could be making an error. As Anaconda is paid-for third party software and KNIME Analytics Platform is open-source this doesn’t fit philosophically.