use collapse class in admin inline model like below
from django.contrib import admin
from unfold.admin import ModelAdmin, TabularInline
from .models import BusinessPartner, BusinessPartnerGroup, Currency, Address, ContactPerson
from django.utils.translation import gettext_lazy as _
class AddressInline(TabularInline):
model = Address
extra = 0
fields = ('address_type', 'street', 'city', 'state', 'zip_code', 'country', 'is_default')
classes = ('collapse',)
class ContactPersonInline(TabularInline):
model = ContactPerson
extra = 0
fields = ('name', 'position', 'phone', 'mobile', 'email', 'is_default')
classes = ('collapse',)