Gutenberg Blocks – Unable to see side edit panel

Hi everyone,

I’m not sure if this is a theme specific issue, or a wordpress bug. We’re using the Cartzilla theme, and for the first time are doing everything via Gutenberg blocks rather than elementor.

However, we’re not able edit the blocks because the panel on the right hand side seems to be permanently minimized/hidden. No amount of zooming, or dragging fixes it. We’ve also tried deactivating all plugins – doesn’t help.

The only solution is to uncheck the “use theme styles’ option in preferences, but this breaks the page and makes it hard to edit.

Here is a screenshot normally: https://imgur.com/1rDHLW9
We then uncheck the “Use Theme Styles” button: https://imgur.com/p6QsR2e
And now it works, but the layout is all broken: https://imgur.com/POElz9i

Is this a theme issue, or something that is encountered normally and there is a solution to?

Thank you!
Alex