Follow the steps below to hide locations of categories in tabs settings:
Step 1 Go to Add or Edit Map scroll down to ‘Tabs Settings’ section.
Step 2 Enable ‘Display Categories Tab ’ inside the Display Tabs.
Step 3 Then check ‘Hide Locations’ tab.(see screenshot)

Hide Location

Step 4Save the map and open it in a browser.

Now You’ll see locations hide from categories tab.

Locaton Hide

Video Tutorial