In some scenarios you'll want not to override Jmeter's Thread Groups configuration.
The most common use case is the use of multiple Thread Groups, each with different Threads/rampup values.
Another use case is when you want to use any of the following thread groups:
- Ultimate Thread Group
- Concurrency Thread Group
- Arrivals Thread Group
- Free-Form Arrivals Thread Group
In order to NOT override Jmeter's configurations, in BlazeMeter's test configuration page check the 'Engines' option and uncheck 'Threads' & 'Users'. That's it! BlazeMeter recognizes the missing values and reads them from the Thread Groups configuration.