- How can I change my environment from the
base (root)environment to newly created environment while using jupyter lab?
You may be interested in GitHub - Anaconda-Platform/nb_conda_kernels: Package for managing conda environment-based kernels inside of Jupyter
As for other questions these look like basic questions about using conda; I would recommend reading through the conda User Guide (User guide — conda 23.11.1.dev3 documentation). As for Anaconda Navigator - I never used it myself so cannot help here; it is a commercial product and they offer some support - see https://docs.anaconda.com/anaconda/navigator/help-support/.
However, there is some exciting work on JupyterLab Desktop support for virtual environments. Stay tuned.