UI11 is still showng after activating UI16 Plugin - Support and Troubleshooting

UI11 is still showng after activating UI16 Plugin Issue  Symptoms -- UI11 is still showing when UI16 is enabled:

-- Users get an extra, popup message looking for username and password

Environment UI11, UI15, UI16

Cause 1. UI 15 plugin is not enabled

2. System Property 'glide.ui.doctype' is disabled

Resolution 1. UI16 has dependency on UI15, make sure UI15 plugin is enabled correctly. Name of the plugin is 'UI 15' with ID 'com.glide.ui.doctype'.

2. System Property 'glide.ui.doctype' must set to true. If this property is false, its telling system to remain in UI11. Add this URL after instance name to see the property:

sys_properties_list.do?sysparm_query=name%3Dglide.ui.doctype&sysparm_first_row=1&sysparm_view=

Additional Information 1. Check this doc about Switch between UI11 and UI15:

https://docs.servicenow.com/csh?topicname=c_UI15.html&version=latest

2. Check out this doc about look and and feel of NOW Platform UI's:

https://docs.servicenow.com/csh?topicname=c_NavigationAndTheUserInterface.html&version=latest