Click Underline to add underline annotations to document text:
Figure 1. Comment Tab, Underline Text Tool
When the Underline Text Tool is enabled, the pointer icon changes when it is hovered over text. Click and drag to underline text:
Figure 2. Underline Text Tool Example
Press Ctrl+' to open the Properties pane for selected underline annotations and view/edit properties:
Figure 3. Underline Text Tool, Underline Properties Pane
•Subject is the name of the underline annotation, as referenced in the Comments pane.
•Author is the name of the user that created the underline annotation.
•Name is the unique name of the underline annotation, as referenced within the application.
•Created is the date and time at which the underline annotation was created.
•Modified is the date and time at which the underline annotation was last modified.
•Printable is the print status of the underline annotation. If this property is enabled then the annotation is printed with the document. If this property is not enabled then the annotation is not printed.
•Locked is the locked status of the underline annotation. If this property is enabled then the annotation cannot be deleted and its properties (including its position and size) cannot be modified by users.
•Layer specifies the optional content layer to which the underline annotation belongs. Further information about layers is available here.
•Fill Color determines the color of the underline annotation.
•Opacity determines the level of transparency in the underline annotation.
•Blend Mode determines how underline annotations blend with overlapping content. These options are explained here.
Note that when the Underline Text Tool is enabled, the Format tab is available and can be used to customize the default properties of underline annotations:
Figure 4. Format Tab, Underline Text Tool
•Click options in the Shape Style group to select alternative default underline annotation styles.
•Click Keep Selected to keep the Underline Tool enabled and add multiple underline annotations to the document. If this option is not enabled then PDF-XChange Editor will revert to the designated default tool immediately after creating one underline annotation.
•Click Exclusive Mode to enable exclusive mode, which simplifies the process of using the Underline Tool. When Exclusive Mode is enabled, the pointer ignores all interactive elements of documents other than base content. This makes it possible to create underline annotations on areas that overlap with other content without the risk of accidentally selecting undesired items. When Exclusive Mode is disabled, the pointer recognizes and interacts with all underlying elements in the usual manner.
•Click Properties to open the Properties pane and view/edit Underline Tool properties, as detailed above.
•When underline annotations are selected, the Style Tools dropdown menu is available in the Format tab. It contains the following options:
•Click Copy Comment Style to copy the style properties of underline annotations.
•Click Apply Copied Comment Style to apply a copied underline annotation style to selected annotations.
•Click Apply Copied Comment Appearance to apply a copied underline annotation style to selected annotations.
•Click Make Current Properties Default to set the properties of the underline annotation as the default properties for subsequent annotations.
•Click Apply Default Properties to apply the default underline annotation properties to selected underline annotations.
•When underline annotations are selected, the Pop-up group is available in the Format tab and can be used to interact with the pop-up note of the annotation:
•Click Open to open the pop-up note.
•Click Hide to hide the pop-up note.
•Click Reset Location to reset the location of the pop-up note.
•When underline annotations are selected, the Arrange tab is also available and can be used to manipulate comments as detailed here.
Note that the Comment Styles Palette can be used to edit and save customized underline annotation styles for subsequent use, and the Commenting preferences can be used to view/edit preferences for all comments.