all thumbnails are not visible in the add step box

[sp9324]

The add step box has a scrollbar that makes it annoying for users to see all the thumbnails. Removal of the scrollbar and widening of the box would enhance the UI/UX.

Before:

After:

version 3.7.2

[welcome]

Thanks for opening your first issue here! This space is protected by our Code of Conduct - and we're here to help.
Please follow the issue template to help us help you 👍🎉😄
If you have screenshots to share demonstrating the issue, that's really helpful! 📸 You can make a gif too!
Don't forget to join our PublicLab Gitter channel and our ImageSequencer Gitter Channel for some brainstorming discussions.