How to stop auto generating text in ShortUUIDField field

I have a model where ShortUUIDField automatically generating ids I want to disable the auto generation

class Mymodel(models.Model):
    pid=ShortUUIDField(length=10,max_length=100,prefix="prd",alphabet="abcdef")
    sample_id = ShortUUIDField(length=10, max_length=100, prefix="var", alphabet="abcdef", null=True, blank=True,default=lambda: None)

I added default=lambda: None in sample_id field but it is still automatically generating the ids. I want the id default to be blank

Set default=None directly without a lambda, and blank=True so the field can be empty.

class Mymodel(models.Model):
    pid = ShortUUIDField(length=10, max_length=100, prefix="prd", alphabet="abcdef")
    sample_id = ShortUUIDField(length=10, max_length=100, prefix="var", alphabet="abcdef", null=True, blank=True)

    def save(self, *args, **kwargs):
        if self.sample_id is None:
            self.sample_id = None  # leave it as None
        super().save(*args, **kwargs)
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