The Floating Window in Sticky Password for Android can be accessed in two scenarios:
1) Go to WebAccounts, select desired web account and tap on Launch. Sticky displays then a window titled "Open with" where you can select the next action. It can be aither opening the URL in our own embedded Sticky Browser OR open the Sticky Window (alternatively open the given URL in any other browser installed on your device, but there we can not support the autofill functionality and transfer the credentials).
2) Second scenario is to go to AppAccounts, select desired application account and tap on Launch. The Floating Windows is displayed immediately. This is because for application accounts on Android we can not (due to specifics/limitation of Android operating system environment) provide the user with the autofill functionality and it also does not make sense to display any other option (to open a browser).