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You can select a source text area to
Prerequisites
You are already using the
change function for source text and have selected the graphical display.Procedure
You can select several source text areas as follows:
Node
The selected node is highlighted.

You can reverse the action by repeating the step.
Subtree
The selected subtree is highlighted.

You can reverse the action by repeating the step.
Block
The selected line is highlighted.
All lines between the start of the block and the end of the block are highlighted. This means that they are all selected.
See also:
Editing Source Text Areas