To remove an unwanted feature, select the feature(s), then either select the Delete Selected Feature option from the right-click pop-up menu or press the DELETE key. Once completed, the feature is marked as deleted and will no longer appear on the display unless the Render Deleted Features option is enabled on the Vector Rendering Configuration tab of the Configuration dialog.
To undo deletion of a feature, simple enable the Render Deleted Features option (see above) to show the deleted features, then select the deleted features and select the Undelete Feature(s) option from the right-click popup menu.
When Render Deleted Features is enabled, the attributes will in the Attribute Editor with a light gray text color.
Keyboard Shortcut:
Render
Deleted Features (Ctrl+Shift+D) - Selecting this option will
toggle the render of features that have been deleted from the workspace.