Hello everybody! Why isn’t the Instagram, Google, etc. website displayed on the webview? All other sites show these are not.
Hi,
Because to restrict the attacks. Read more about this -
https://www.hackingarticles.in/android-penetration-testing-webview-attacks/
It turns out on Adalo there is no way to direct the user to your Instagram?
To redirect to Instagram use website action
What do you mean? What needs to be done for this? do not quite understand
Sorry. Understood. But in this case, you can’t get back into the app!
Make a screen and make a Web-View and then add a back button in that screen, done! 
I did this, all sites work except Instagram, Google, and so on