Hello,

1. To remove them from a mobile menu you need to edit your header with Header Builder in Dashboard -> WoodMart -> Header builder, switch to mobile layout and edit the mobile menu element. There, you are able to disable the categories menu https://gyazo.com/c443511ff85bc39553e5066352e7a45e

2. To remove the other menu from the mobile, please use the below custom CSS code and paste it to Theme Settings >> Custom CSS >> Mobile CSS section:

.widgetarea-mobile {
display: none;
}

Best Regards.