Instant run is missing in Android Studio 3.5
They removed Instant Run, replacing it with "Apply Changes". See the release blog post for more about the change. And the docs have more information about the nature of "Apply Changes".
in version 3.5 it looks like...
If you use the "Green Arrow" (Run app), Apply Changes will not trigger. And since "Apply Changes" does not alter the generated APKs there is no point "disabling" it.
- If you click Run App, a normal APK is generated, installed and run. Instant Run is not invoked.
- If you click "Apply Changes" or "Apply Code Changes", a normal APK is generated, installed and then Apply Changes triggers via class swapping.