In 7.0 the color attribute in nav of default.xml controlled the background color of the menu in a simple xml application. In 7.1 it controls a new highlight bar showing the current menu selection. See screen shot. Is there a new attribute to control the actual background color of the menu area?
@simpkins1958, this is an expected behavior in Splunk 7.1 where color applies to Splunk App's icon and selected Navigation Menu but not to the App Bar. If you need App Bar to be highlighted in dashboards you will have to perform CSS Override as suggested by @alacercogitatus.
@lqiao2 you should get Splunk 7.1 Overview App from Splunkbase which lists out new features of Splunk 7.1 including the move towards Modern Look & Feel and Style Consistency across Splunk.
From Splunk product's perspective I would say that it gives it a consistent look and feel where Custom Splunk Apps created within Splunk will have their own Icon Color and Navigation Menu Highlight color.
Instead of Distinguishing Color from App Bar, it is now App Icon, which to me is a changed for us to get used to 🙂 Do get the Splunk 7.1 Overview app to check these out. Also, with the launch of newer versions corresponding Overview apps are also published on Splunkbase for us to check out the new features being introduced and get hands dirty to see whether they fit our needs.