To change the title of route tab, Follow below steps :

Step 1 Go to Add or Edit Map scroll down to ‘Tabs Settings’ section.
Step 2 Enable ‘Display Route Tab’ inside the Display Tabs.
Step 3 Change the ‘Route Tab Title’ as you want to display.

Change Route Title
Step 4 Then click Save Map and open it in browser.

Then you will see route map title change from your map.

Map Title Display

Video Tutorial