You should use min. 6 decimals in the Wizard setup, that is what's recomended for TC to work good
But you dont need to show them all in the Dimension, working in Metric and with Architechual stuff i normally set precision to 0 for dimension, metal will very often use at least 3 decimals for precision work
All this you can adjust in the Dimension's Property, before or after if you forgot it at first, but that can be boring to do later.
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