Hi! Today when I open my desktop it starts everything normally, but I don’t have the typical start panel at the bottom with all my apps openend. How can I fixe it?
Do you mean the Kickoff launcher? Or the pinned application launchers? Or the whole panel?
thw whole panel. When I start my session I only have the wallscreen
I use alt+F2 to open apps like firefox etc. But I can’t minimize them because I don’t see wherer are they
Sounds like the Plasma shell didn’t start correctly. You can try starting it manually 
, relog, or reboot.
kstart5 plasmashell
You may be interested in why it failed though.