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The tools allowing you to select features in the visualization window are regrouped in the Selection menu:
Regardless you want to make a simple or a multiple selection, you have to be in edition of the correct construction layer.
You have to ways to select a unique feature:
The multiple selection is made with the selection tool. You can either click and drag your cursor to select all the features within the rectangle or by selecting single features one by one maintaining the Shift key.
The information window is accessible with the menu window → information window. When selecting one or several features, it allows you to display the attributes of each selected feature.
By right-clicking on a feature ID you can access to a contextual menu with the following operations.
The Layer tab of the Information window displays all the informations on the layer in edition (Layer of the selected features).