is it possible to highlight all drills with the same size inside of the board? E.g. I want to highlight all vias with size 0,25mm. And is there a way to list all drills and their position?
Yes try the Find by Query command. In the Find Pane click on Find by Query, in the list on the left double click Vias (which moves it to the Fields column). Now choose Finished Hole Size and choose Height or Width, This is now shown in the Filters. Double click the Finished Hole Size=* and then pick the via size you are interested in and the list at the bottom now shows all the objects. You can either click each one to locate or select the square in between rows and columns and all are selected in the design.
Thank you very much!