Here's how you can enable alphanumeric sort for your screens:

1. Go to your prototype.
2. Click the More button above your screens (•••).
3. Click Use Alphanumeric Sort.
4. Click Confirm.

Please note that when you enable alphanumeric sort for your screens:

• Screen sections are removed
• Screens are no longer draggable
• Sorting will apply for all collaborators on the prototype