Install just the spyder-kernels package into the myenv environment, and set your Python interpreter path in Spyder's Preferences to point to myenv 's Python executable (see the final section.

If Spyder is installed with Anaconda (as we recommend) and launched via a shortcut, from Anaconda Navigator or from Anaconda Prompt without modifying anything, this will be the default base Anaconda ...

Have you ever wished you could edit Python packages installed locally without reinstalling them? Editable installs are the way.