Yes! Please see How to revert back above.

Yes, it is absolutely possible to edit any options after applying a preset. Presets are just an easy way to get started. They give you a good base optimization to start with, but many complex websites will need more fine-tuning to achieve their best possible page score or user experience.

We suggest trying the Advanced preset because it takes a balanced approach to optimization and speed. You shouldn’t need to manually tweak many settings, but if you do experience difficulty, you can always revert to your previous settings, or try the Basic preset.