Django filter_horizontal - how to connect more fields together

I need to connect more fields to one filter_horizontal parameter in Django Admin as string. I have three many-to-many variables:

class EducationTypeAdmin(admin.ModelAdmin):
list_filter = ("qualifications", "school_levels", "subject_groups")
filter_horizontal = ["qualifications", "subject_groups", "school_levels"]

This code will make 3 seperate many-to-many horizontal filters. I need them to be in one. Ex in admin:

AS, English, High School --> 

Main thing is that I need to configure the string in the box. Sorry for my weird explanation, but if you have any questions, let me know.

Okay, I was little confused how it works but all what I needed to do was overwrite the __str__ function under the qualifications.

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