How to Make the File Mask Permanent - Currently Resets When WinSCP is Restarted

So i like using the File Filter Mask to hide certain files including some that start with "." -- supposed hidden files. The issue is when i filter them out they return again when WinSCP restarts. Anyway to keep the change permanently?

The file panel filter cannot be persisted. But to hide the hidden files, you do not need to use the filter. There's a separate option for that.
See https://winscp.net/eng/docs/ui_file_panel#hidden_files