UI fails on macOS 26.4.1

[mrk737]

Describe the issue
The application UI has several glitches on macOS 26.4.1 does not refresh sheet contents, overwrites other lines, etc.

To Reproduce (optional)
Open saved sheet or create a new long sheet and it starts to act up.

Screenshots (optional)
https://github.com/user-attachments/assets/02142fd6-1ca6-4ee4-9482-5e979f407f8f

Device (please complete the following information):

• OS: macOS
• Version 26.4.1

Additional context
Add any other context about the problem here.