Hi! I am using Helix Ultimate. Super standard Joomla 4 installation, with just SP Page Builder, Helix Ultimate, no other plugin installed.
I have just tried on Chrome, because I always use Firefox, and surprise.. on Chrome it started ok, with default width. I slide to the right, ok double width, then I tried to go back sliding to the left, no results. Once gone to the "doble width", no way to go back.
But I realized, it must be a browser setting! So, looking around, I have found the solution, just need to reset the local storage key "sppb_siderbar_width" from "600" to "false", and reload the browser. See the screenshot:
https://www.renovant.tech/2022-07-26_18-28.png
It would be great if you can find why it is impossibile with mouse slide to the left.
I'll let you know if I can give you admin access.
Thanks
Best regards