I found themer’s template show if do not have hierarchy function, this is not normal, let me try explain:
for example: I have
parent category: company
child category: graphic design company
child category: package design company
child category: interior design company
now: if I want apply one template to all the posts under “parent category”, I need set
show if>singular>company>graphic design company
show if>singular>company>package design company
show if>singular>company>interior design company
if I have more than 20 child category, we need set 20 times here, this will be a problems.
so: I would suggest,
if I set “show if>singular>company>”, the template will apply to its all “child category” posts by default.