Usually, I would be able to increase the length of the text/subtitle. I do not know how I would normally fix the issue without having to do ctrl+z to undo.
With those clip sizes, you will need to zoom in further into the timeline to click and select edit points.
Alternative methods like nudging, Trim menu actions and the change duration dialog are still acessible, but mouse selection and trim are deliberately simplified below a certain clip size to avoid accidental edit actions.