Hello Stefan,
Sorry we cannot see your screenshots.
Could you please go to iReal Pro Preferences>Utilties and click Reset All Settings.
Does this make any difference?

There is the user guide in the Help menu, and these tutorials:
https://www.irealpro.com/video-tutorials/mac
Do these help related to what you are wanting to do?

You should be able input chords in Edit mode:
https://technimo.helpshift.com/hc/en...3176988/?p=mac
Then use the Close button at the bottom of the Editor controls, then the chart should show with all the chords etc. you have input.

Thank you