During the incoming/outgoing calls, the bubble will appear to prevent interference on identified calls.
So, if you want to perform quick actions on a contact, you can open the Caller ID and apply all the steps explained above.

if you are not interested in this feature, you can change it through the settings.
Open Meapp–> Tap on the logo–> Open the Caller ID settings-->
Turn off or on  “Show contact’s Caller ID bubble.”