Limit the number of times of block to be dropped

Hi @confettidc, you can try doing something like, have a counter variable and update it once a block of a type is added and remove the newly added block if the counter condition is satisfied.

editor.on('block:drag:stop', (comp, addedBlock) => {
  // if the counter condition is satisfied then remove the component `comp`
  // else check the type of 'addedBlock' If it matches with the one you want to limit  and update the counter 
})

Do check the API Reference.