In Android, I long press the icon, then a pop-up for app info appears. Tap that, then go to "Storage" and click Delete Cache, or clear cache, or something line that. BE CAREFUL that you don't click the other button for deleting all app data.
Discussion
Yeah I use an iPhone and can’t do that and don’t see it in the in-app settings or in the settings in my phone for fountain. I’ll have to reach out.