When this icon is displayed, the preview is deactivated.

If the mode is deactivated (no preview), it will not be possible to temporary activate it in the command. You must first activated the preview mode, to be able to temporary deactivate it in a command by clicking on .

When this icon is displayed, the preview is activated.

The mode is active, it can be temporary deactivated in a command which manages this mode. . If the mode is deactivated (no preview), it will not be possible to temporary activate it in the command.