Press the Smart Filter Configure button on the left side of the screen.
See the Smart Filters displayed on the Smart Filter Configuration Page screen.
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If you have the due permissions you can access the Manage Smart Filters (a) via Settings → Jira Settings → Apps as shown below or will be listed on the Jira sidebar menu Apps (b).
(a)
(b)
2. A list view of your Smart Filters will be displayed on the configuration page screen.