Is your feature request related to a problem? Please describe.
Can't find the fifth label when I hit the minus symbol on the label list sub panel.

Turns out that the display was scrollable.

Describe the solution you'd like
A visible bar that would indicate scroll ability when there are more than 4 labels in the label list.

Describe alternatives you've considered
An arrow that points down to the hidden labels.

Additional context
Steps to reproduce:
- Create new project.
- Add 5 labels.
- Use the remove button to remove the fifth label.
OS: Windows 10