The lowest icons on commandbar don't show up. (FHD Monitor used)

What can I do to show them?

There should appear a Triangle to reach out for the other tools/commands:

Yes, I know, but I thought that it can be done in the preferences

What do you expect in the preferences then? Should icons shrink to your monitor resolution? Just asking.

you are right. probably the resolution can't be shrinked easily

We just can have smaller icon sets (requires restart) but can't tell if this will work for your screen res.

That's what I was looking for. I have read about it in a book, but don't know in which Menu it can be set. Can you say me, where?

Sure:

cool. thank you. Alas, I already have the smallest icons. So save money to buy a bigger monitor. 😊

It might be possible to create your own even smaller set of icons. I'm guessing. If you shared them too that would be cool.

That exceeds by far my skills and my time.

I don't think smaller icons will result in a smaller menu - maybe less width but not decreased height unfortunately.

Solved problem myself. I had View set to "wide" instead of "default"