Nat is correct. But, to a limited extent, text font size and positioning (not the font itself), can be adjusted. Worth a test.
Select (highlight) all text clips, then click the fx button on any one of them to open the effects window.
Click the green + at the top-left of the toolbar and choose the SCALE effect, as an example.
Scale and position the text to taste.
Then click the 6th button from the left on the toolbar ("replace effect chain"). The changes will be applied to all selected clips.
If the result doesn't please, simply click the X for the effect, to delete it.