Found this thread when searching for the same issue, so here’s my solution for future discoverers:
Had the same problem, when trying to exactly position child components in ortographic view.
Found a workaround which worked for me:
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select root component in components viewer
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in details view / transform, scale up, e.g. to 10. This should also scale up all child elements
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do the positioning work
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again select root component, and reset scale to 1