Adobe Illustrator RGbB not showing anything

Hi I need your help with my Illustrator because when I open my previous RGB files there are no objects shown but I can see the objects through my layer tab and when I tried to put some shapes with colors they are not visible on the artboard. See example image below:

but when I tried to switch it to CMYK document color profile the objects appeared:

Do you know what's the problem with my Illustrator? Thanks