Hello Yong Wang,
Thank you for your interest in FIddler Everywhere and for your feedback. The downloaded version fo your Fiddler Everywhere is 0.5.0 and currently the team is about to publish new version of Fiddler Everywhere where there are multiple improvements in the UI including a reworked Settings section. The new version is expected to be published live within several days and will be available from the download link. Once it is published the workflow for enabling the root trust certificate will be as described in the related documentation.
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