When changing the way to access the subcategories in this version, they are not shown from the mobile as in Alpha.
The user cannot be asked to access the subcategories by using the filter button, the subcategories in the mobile version must be displayed when a category is accessed.
Ideally, use the way to access subcategories from a mobile phone as in Alpha theme...
Attachment 1 = Alpha theme with subcategories
Attachment 2 = Beta Osclass theme without subcategories