The era of the compact flagship smartphone has begun with the release of devices such as the Vivo X200 Pro Mini and Xiaomi 15. Now, handsets of this size are backed to start getting even more portable with an upgrade to foldable main displays. Their design could make them even smaller than current devices such as the Motorola Razr 2024 when closed in the future.https://www.notebookcheck.net/Android-OEMs-tipped-to-start-making-foldable-versions-of-Pro-Mini-smartphones-in-the-future.948561.0.html
6"3 screen is not compact. You can called it whatever but anything above 5"5 inch is standard size