Hello,
We are really sorry, but these features doesn't come from HikaShop, but rather unless we are mistaken from your Template.
It seems that this template offer an accordion feature for categories on several levels.
You can check it by yourselves by switching from your current template for a default one, like ProtoStar.
From this, we see 2 possibilities :
1. You have some settings in your template
OR
2. You contact your template creator in order to adjust this to your needs.
Hope this will help you to adjust this.
Regards