How do I ensure that the Launch window appears on macOS when no other window is visible?
On macOS, SnapGene shows the Launch window on startup, but by default the Launch window will not reappear when all other windows are closed.
Click SnapGene → Preferences (macOS) or Edit → Preferences (Windows or Linux). If necessary, select "General" in the sidebar.
Check the option to "Show the Launch window when all other windows have been closed".