If the WordPress language is RTL and we configure the Builder settings as such, the context menu orientation will be different in Canvas and the structure panel. In fact, in Canvas it should be LTR, but it is RTL.
Please let us know if you are still experiencing issues.
As with any pre-stable release, please do not use it on a production/live website. It is only meant for testing in a local or staging environment. The more feedback we get, the better