Hmm, I assume you haven't changed the mouse modifiers? You can check in Preferences, under Editing Behavior/Mouse Modifiers, for "Context MIDI piano roll" and "Left drag". The default action for me is "Insert note, drag to extend or change pitch".
Maybe there are other settings that could affect this, but I can't think of what they would be off the top of my head...
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Artist name Ben Enkindle. Making electronic music exclusively with Linux software.
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