From FreeCAD Documentation
- ViewKeep Label: Always show View Label if true.
- ViewLineWidth: The thickness of visible lines. See Line Groups.
- ViewHiddenWidth: The thickness of hidden lines, if enabled.
- ViewIsoWidth: The thickness of isometric(u,v) surface lines and Dimension lines.
- ViewExtraWidth: not implemented yet.
- ViewShowCenters: Circle/arc center marks on/off.
- ViewCenterScale: Circular arc center mark size adjustment, if enabled.
- ViewHorizCenterLine: Show a horizontal centerline through view.
- ViewVertCenterLine: Show a vertical centerline through view.
- ViewShowSectionLine: Show/hide section line if applicable.