Hello, @stianand,
First of all, Thanks for your understanding. Now regarding the category issue that you asked let me answer it.
Settings a category page into the menu is quite easy. Go to the Dashboard >> Appearance>> Menus >> From there add the category you want into the menu item then save settings. By doing this whenever someone clicks on the category menu item it will redirect the user to that specific category page.
Please refer to this screenshot: https://postimg.cc/4m1xnFf6
And then the shop sidebar having all the filters set will be displayed on that product category page as well.
Best Regards,
PThemes Team.