The displayed note length is not necessarily the actual note length. It also depends on the note values and rest values for Display Quantize in the Staff Settings dialog. This is important to remember when you change the length of a note.
You can change the length of a note in the following ways:
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Select the notes that you want to change and Ctrl/Cmd-click on one of the note icons on the extended toolbar.
All the selected notes are assigned to the length of the clicked note.
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Select the notes that you want to change and edit the length values on the info line.