many kernels, jupyter lab and resources

Hi,

As I started to use jupyter notebooks I added several kernels for
different projects.


Whe I start "jupyter lab" each kernel is started. Can I just start the
kernel I want to use... I mean I'd like to have the icon to choose to
open a notebook for that kernel but to start the kernel only if I
click on the icon.

How can I limit resources when they're not needed?


sandro