Before display categories in Tabs make sure you create and assign category to the map.

To display category tab you can follow below steps

Step 1 Go to Add or Edit Map and scroll down to ‘Tabs Settings’ section.

Step 2 Enable ‘Display categories tabs’ option inside the Display tabs.

How to display categories in Tabs Wpmapspro

Step 3 Save the map and open it in a browser.

Now you’ll see the category tab on the google maps right top corner.

Display Category Tab on google maps wpmapspro