3d object not visible in game view

hey,

i am new to the unity .i am just trying to bulid a scene but when i created a 3d object its not visible in my game scene. i have tried to google this issue but nothing helps .Can some one plz help… Just FYI i am using 2021 unity version…

thanks for your response , i have attached some screenshots ,please let me know if anything else is required.