Fill whole screen while run on frame buffer


I run sample LVGL project on Raspberry Pi4 frame buffer device on standard PC monitor. I have small picture in the corner:

How to increase it in order to fill whole screen?

fbset returns

mode “1824x984”
geometry 1824 984 1824 984 32
timings 0 0 0 0 0 0 0
rgba 8/16,8/8,8/0,8/24

Try increasing LV_HOR_RES_MAX and LV_VER_RES_MAX.