You should know VITALS never modifies your theme, so there is no need to uninstall and install again the app because that might affect your billing cycle and you can be charged by Shopify twice for the same period.
There is nothing you have to do just enjoy VITALS :). If on your theme files something seems to be out of place, just adjust the positioning of various elements or us know. There are some exceptions with a few themes. For example, if you’re using Turbo -> switch to Sport Mode and the apps will work.