Navigate to WoodMart > Header builder > edit current header > add the browse categories elements in the header and choose the categories menu: https://prnt.sc/GAEwUkFgxBz1
These are product categories. Please navigate to Products > Categories to check or manage your categories.
Then go to Appearance > Widgets and edit the Product Categories widget located in the Shop Page Widget Area to customize how it appears in the sidebar.
If you have any questions feel free to contact us.