With a 14ga jumper mine reads 1.7 ohms. This is not crazy as most meters are somewhat similar and you just remember that as your zero point.
But them I though of the zero button!
However, it changes the reading to -7.90 ohms. Very disconcerting at first. I am sure you will get this working in due time. It will be great if we could use this as a relative mode and be able to baseline to zero any reading. However, I beleive there should be some visible warning that it is in relative mode and the “actual size may be larger than it appears”