Displayed Resolution On the Lower Left Different From Actual Device Resolution

Good day, I’m currently working on an android app and I noticed something. Why is the resolution on the lower left of the UMG UI differs from the actual phone resolution? It should be same right? Did I missed something? I know it can be resized to the exact but I have a gut feeling that It was that for a purpose. (1440 x 2960 actual and 624 x 1280 lower left of ui). Should I stick with that recommended? Or do I really have to adjust to the actual res of the device?

https://scontent.fmnl17-1.fna.fbcdn.net/v/t1.0-9/86970050_2875930895802165_7446612863285723136_o.jpg?_nc_cat=101&_nc_sid=ca434c&_nc_eui2=AeEewHjsnsvagQg5uJ6H3pn4q7kgcLbOZLDmt75vyP5FK6pRaXy6HYlSwjB55fwvQAbbtqDMxwKSmbX6G0Kd2ISdec4_ye2_IkgyTnSWD_pyYg&_nc_oc=AQmu14ulpd3vhrJoUHF3wyLFW_eXZAbd7_r1ea72rZHnUDsl0vtalAeptOdYNdttKdo&_nc_ht=scontent.fmnl17-1.fna&oh=cc30ab243593e0a1fadc54f311eca5b6&oe=5E8EA506