I was able to use the workspace setting that other people on this page have been asking for.
In Preferences, ?+P, search for python.pythonPath
in the search bar.
You should see something like:
// Path to Python, you can use a custom version of Python by modifying this setting to include the full path.
"python.pythonPath": "python"
Then click on the WORKSPACE SETTINGS tab on the right side of the window. This will make it so the setting is only applicable to the workspace you're in.
Afterwards, click on the pencil icon next to "python.pythonPath". This should copy the setting over the workspace settings.
Change the value to something like:
"python.pythonPath": "${workspaceFolder}/venv"