I am having the same issue. I cannot flip a mirror image of a line. And the rotate feature that was suggested does not work. Flipping a line is a great feature but currently this is unavailable.
Hey there thank you for posting in the Lucid community! Our sincere apologies for the delayed response on this thread--I wanted to follow up in case this answer may still be useful to you and to provide a solution for other users who see this thread in the future.
There isn't a way to flip a mirror image of a line but you can reverse the direction of the line is using the "Swap Line Ending" tool (details here). Hope this helps!
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