What determines initial number of forms in Django modelformset_factory?

My model formset is producing an initial 7 forms, as seen here:

<input id="id_form-TOTAL_FORMS" name="form-TOTAL_FORMS" type="hidden" value="7" /><input id="id_form-INITIAL_FORMS" name="form-INITIAL_FORMS" type="hidden" value="7" />

I would like to alter that number, but cannot see how.

view and form for ref:

def micro_log_create(request):

    MicroLogFormSet = modelformset_factory(Micro_Log, form=MicroLogForm, max_num=4, extra=0)

    if request.method == 'POST':

        formset = MicroLogFormSet(request.POST, request.FILES)

        if formset.is_valid():

            formset.save()

            return reverse('micro-log')

    else:

        formset = MicroLogFormSet()

    return render(request, 'app/micro_log/micro_log_create.html', {'formset': formset})

class MicroLogForm(forms.ModelForm):

    class Meta:

        model = Micro_Log   

        exclude = ['user', 'date_time']

MicroLogFormSet = modelformset_factory(Micro_Log, form=MicroLogForm, max_num=4, extra=0)

formset = MicroLogFormSet()

Thank you

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