We have released VNC Viewer for Android 4.1.0 which resolves this issue.
We are aware of an issue with VNC Viewer on Android 13 where the toolbar cannot be displayed in-session after it is dismissed. Our team are working on an app update to address this.
In the meantime, as a workaround you can pin the toolbar using the pin icon on the far left of the toolbar when it appears at the start of a connection.
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