Running Jupiter Lab via Command Line WIndows

I have followed the instruction on the official website of Jupyter.

I installed JupyterLab with pip:

pip install jupyterlab

And then I tried to run JupyterLab with:

jupyter-lab

It says the following error:

'jupyter-lab' is not recognized as an internal or external command,operable program or batch file.

I checked the Environment Variables (I use Windows 10) and I am pretty sure that it's correct.

I tried to use the following command:

python -m notebook

but is says this:

C:\Program Files\Inkscape\bin\python.exe: No module named notebook

Why does it use the path for Inkspace (it's another program) to run python? And why is python installed in this folder?