Hi teanooks01,
Thanks for reaching to us.
First of all, take my apologies for the delay in answering because of the weekend.
Navigate to WoodMart > Header builder > edit default header (highlighted star icon) or you can go through admin bar directly https://prnt.sc/Ct9ehRDvvDV9.
Switch to Mobile tab, hover on Mobile menu element, click on Pencil icon and scroll down to Category section > disable Show categories menu
option https://prnt.sc/z532Aa-glTHl
Regards,