To run demo and lab notebooks, I am required to have the following Databricks runtime(s): 15.4.x-cpu-ml-scala2.12 but the compute in my setup is of the following runtime version, will that be an issue? 11.3 LTS (includes Apache Spark 3.3.0, Scala 2.12)

I am also seeing a warning for the worker type: Warning: compute in this mode needs at least 1 worker to run Spark commands or import tables. 

how to increase that?