When running DbVisualizer on Windows, the FlatLaf Look and Feel library extracts a DLL (Dynamic-link Library) into the user's temp directory. This DLL is used for native Windows decorations and is called something like "flatlaf-windows-x86_64-203018993023000.dll" - please refer to FlatLaf Window Decorations for details.
The DLL should be safe to use, but some users have reported that this may trigger security systems that block the application from loading since the DLL is placed on the user's disc (in the temp directory).
You can disable the native Windows decorations and prevent the DLL from being extracted by using Tools -> Tool Properties -> Java VM Properties to set the following VM argument:
-Dflatlaf.useWindowDecorations=false