I was able to replicate and wrote up an internal ticket for this. Right now it doesn’t look like there’s anything you can do to fully get rid of that bottom scroll bar, it appears that there’s an issue between the width of the dropdown not ever completely fitting the width of the table inside of it.
The issue of the table not resizing correctly when you added more characters to induce the scrollbars has been noted as well. It should re-render immediately once that happens, but doesn’t appear to do so until you leave the window and return. Both of these issues are in the same internal ticket and should be resolved at the same time.