Format questions

Hello,
I have just purchased the premium version and have a few questions around set-up and formatting:

1. How do I adjust the price values to zero decimal places? The default is two decimal places? E.g. I would like to see £10 rather than £10.00
2. How do I turn off the Announce system bar? I only want the bar to appear for Message Purchased, Message Success, and Message Error scenarios
3. On mobile the bar overlaps with my logo which looks messy (on desktop it is correctly formatted appearing above my logo). How do I fix the format so the bar appears above the logo on mobile as well?
4. The text is appearing off centre (aligned slightly to the right) on mobile, how can I get this centred?

Thanks!
Alice