No preview in Cura 4.4.0?

[Brassovits 0]

Hi
I am definitely a beginner in CURA. I have watched various videos on Youtube for beginners, but can't really get my first test print file made.
I have the problem that when the program reaches 'preview', nothing appears. I have downloaded the leveling test file from this site: https://www.thingiverse.com/thing:3162145
and placed 4 parts in Cura.
My ptinter is a Tevo tarantula Pro.

TT_Bed_Level_Test.3mf

[ahoeben 1,992]

Perhaps you have made your objects thinner than the initial layer height?

[Brassovits 0]

Maybe you'r right? But I just downloaded and importen the file to CURA. At the først the object looks like a solid circle, but After slicing there is No object shown.