System -> Settings -> Option -> Products -> Category Product Count: No
Ref docs: https://arastta.org/docs/user-manual/system/settings/option

I recommend you make yourself familiar with the documentation and all settings, go through it all step by step, it will save you a lot of time and questions.

And also please don't add several issues / cases into the same topic, create a new for your other issues / questions, with a fitting title and category to help other who use the search function to find the answer. Please look at https://arastta.org/forum/welcome-to-arastta-forums and the linked sites, rules and tips.