There is no way to reset the mirror tool axis position. The only way is to close Krita and open up a new instance. The solution would involve adding a button by the Reproducible: Always Steps to Reproduce: 1. Start the multi-line tool 2. move the axis 3. Stare in confusion because you cannot reset it
Just to clarify. the proposed solution would include resetting the x OR y position. There needs to be two actions.
WISHGROUP: Small Usability Fixes
This implemented now, isn't it?
Yes. It must have got added at some point without tagging the bug. Done!