Hi Chang,
Thanks for using Onyx! You can turn off the „=0.0“ by choosing „Customize Model -> Change Path Style“ and select „label only“. I use the same workaround that you suggest here by typing some numbers in the label if I want to show students / readers something specific. You can, however, also turn off standardized estimates to show automatically, by selecting „Show Standardized Estimates“ on a path.
Cheers,
Timo