Issue has been identified and a fix is being made. It will be rolled out with the next update of SSMS 18.
SSMS crashes constantly. Just start it up, open 2 command windows, and drag one of them (i.e. to dock side by side). It crashes immediately and consistently. Running version 14.0.17289.0 and it says SSMS is up to date. (Help/About lists it as v17.9.1, so not sure why the versions listed by update and help are different).