This article points to how to stretch the image on Reolink software. You may click the links therein based on your need.

Applies to: All Reolink Cameras and NVRs

The stretching mode will make the camera display the image in full screen on the live viewing window without borders. This article will guide you on how to set it up on Reolink App and Reolink Client respectively:

How to Stretch the Image on Reolink App

How to Stretch the Image via Reolink Client (New Client)