In one week I have a red bar for time and load. I have not set any goals for those weeks, so I am wondering why the bars are present in that one week.
And for this week:
These are your planned workouts (on 10 Nov and 28 Dec). You can disable the bars with:
Options → Edit Layout → Click on the gear on the left side (summary) → Disable “Show progress bar”
Ah, so if I plan some workouts - but also do workouts that are not planned. It will show, that I did more, than I planned?
Correct. If you plan all your workouts, you maybe want to see if you are “on plan” or over-/underreaching. But for planning only some workouts, it doesn’t really make sense to show this bar.