Enhanced Flows List View as Part of Winter 20 Release
Salesforce enhanced the Flow List view with Enhanced Lightning style list view look like Lightning Email Template List View, Object Record List View 🙂
How to Enable Enhanced Flows List View?
Goto Setup -> Process Automation -> Process Automation Settings -> Select “In Lightning Experience, use the enhanced Flows page and separate Paused and Scheduled Automations page”
Missing Paused and Waiting Interviews Section under Flows?
Yes, Once Enabled the Enhanced Flows page then Paused and Scheduled Automations page is separated with new page under the Setup -> Process Automation -> Paused Flow Interviews as part of Winter 20 Release
Refer the Winter 20 Release Notes: https://releasenotes.docs.salesforce.com/en-us/winter20/release-notes/rn_forcecom_flow_mgmnt_enhanced.htm