Sometimes we need to protect an electric stove from being inadvertantly turned on.
A search for “STOVE KNOB BABY SAFE” led me to lots of good products for under $15.
These are plastic bubbles that you fit under and around the oven knob, and they have a button to release the dome. While the dome is closed, you are unable to turn the stove knob. When you open the dome you can use the knob.
Amazon has some additional options.