Can I use only one earbud at a time with the JBL Tune Flex?

Yes, the JBL Tune Flex supports both Stereo Mode and Mono Mode via the Dual Connect + Sync feature. In Mono Mode, you can use either the left (L) or right (R) earbud individually. (Page 7)

From the official Jbl Tune Flex Earbuds manual, page 7

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