It's tough to replicate this issue without the workbook. I would check out Anonymize your Tableau Package Data for Sharing to see if you can create a workbook that successfully shows us the issue.
2 of 2 people found this helpful
Throw a Blank in the bottom of the container and it will fill out that space. After you put it in there, you can then edit it's Height to 5 pixels, and the Chart/Legends above it should expand.
Thanks guys. I'll probably revisit this one some time soon.