Why is this happening?

[gad13l]

[Ton Frederiks · Accepted solution]

Because you created a new document based on a video preset.

Try a print or art & illustration one.

[pixxxelschubser · Accepted solution]

What exactly do you mean?

The screenshot shows a new document based on a video preset (for Video and Film document). Use a web or a print preset if you want the "normally" displayed (RGB or CMYK) document.

Or do the following:

see post #13 here: Re: Starting with Illustrator, problem with background and artwork

Have fun

😉