To reset a bar style, right click on the bar and select Bar styles
Now click the Reset button at the bottom of this dialogue and the bar style will revert back to its default.
MS Project – How to reset bar styles?
To reset a bar style, right click on the bar and select Bar styles
Now click the Reset button at the bottom of this dialogue and the bar style will revert back to its default.
AX / Dynamics 365 For Finance and Operations blog 