when configuring the sidebar settings of an app embed block, it seems that Shopify is applying wrong styles that make the sidebar customization to be extremely high.
I just checked it and it seems that has been fixed, thanks a lot.
Btw, it has happened several times in this community that Shopify fixes a reported issue but they don’t report that it is already fixed. It would be great if they post updates on a reported issue, as it would help others in the same situation