Hi,
There is no link with your products. It is just some configuration options.
You have to check your options for your menu (and module). If you change the Main option (in the HikaShop configuration), it would impact all your site.
If you just want to impact the category listing. You have to edit the module configuration which is associate with your menu category listing.
Open your category listing menu (in HikaShop). Look at the bottom left, click on the associated module and configure it.
Regards,
Jerome - Obsidev.com
HikaMarket & HikaSerial developer / HikaShop core dev team.
Also helping the HikaShop support team when having some time or couldn't sleep.
By the way, do not send me private message, use the "contact us" form instead.