Unable to filter out tasks not Open for time Entry in the New UX

Document ID : KB000100350
Last Modified Date : 06/06/2018
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Issue:
Unable to filter out tasks not Open for time Entry in the New UX (User Experience)
Resolution:
This is by design, as this filter field is only for the actual status of the task such as Open, Not Started, or Completed. However, an enhancement was put in as of 15.4.1 to be able to filter out tasks not ope for time entry. 

See details on this change and other changes in the Change and Impact Guide for 15.4.1 

Excerpt from the documentation on this change:

A new filter option, OPEN FOR TIME ENTRY is available on the Add Work page. You can filter the tasks that are open for time entry. The default value for the filter is ALL. 
Additional Information:
Reference KB000093171 - What are the known New User Experience (UX) defects?
Reference KB000093166 - Where can I find New User Experience (UX) knowledge documents?