Example run different then live demo in brower

Hi all, i’m new to Littlevgl and i’m targeting V7,9,i run [lv_examples]lv_sim\lv_examples\src\lv_demo_widgets on pc simulator.
i can’t slider the tabview from left to right,what’s wrong with it?

Which PC simulator on which OS?

@embeddedt thanks for reply,i use visual studio 2019 on windows 10.
and i compile this demo to my hardware platform(esp32+2.4inch tft(st7789v)) ,
same to pc simulator. the project is from https://github.com/lvgl/lv_sim_visual_studio_sdl,
and nothing changed to this demo,lvgl is up to date,i can’t find what’differrent,please help me ,thanks.