To perform X-Cart categories search you can use products toolbar or use context menu. You can perform category search by X-Cartcategory name or category ID.
Conditions and Search Options
Text to Search field - type a few letters of X-Cart category name or its ID and press [Enter] to see a list of products that match your request
open category for editing, enable the corresponding check-box and double clicking on X-Cart category you need.
Exact match - enable this option if you wish to see the list of X-Cart categories with exactly the same name/model.
Results
Store Manager shows you a list of X-Cart categories that match your request at the "Results" pane.