CDKToolkit: how to change the name of the stack

After issuing $ npx sst start I got this error message during the SSTBootstrap:

The stack named CDKToolkit failed creation, it may need to be manually deleted from the AWS console

Getting to the AWS console I noticed that “The stack named CDKToolkit” was in fact there, but it was the only stack with such a simple name. There were many other stacks, with complex / unique names (to avoid clashes, I guess).

So my question is, how can I change the name of the CDKToolkit stack used in the bootstrap to something else?