how to fix incoming call popups disturbance during using phone

There are a few things you can do to fix incoming call popup disturbance during using your phone:

Check your Do Not Disturb settings. Do Not Disturb mode will silence all notifications, including incoming calls, so make sure it's turned off when you don't want to be disturbed.
Enable incoming call popups. On most phones, you can choose to have incoming calls displayed as popups instead of full-screen. This will allow you to continue using your phone while still seeing who's calling.
Use a third-party app to manage incoming calls. There are a number of apps available that can help you manage incoming calls in a more convenient way. For example, some apps allow you to silence calls from specific contacts or numbers, or to send calls directly to voicemail when you're busy.