You can set this in the Startgroup settings of the relevant final event. For example, for the startgroup "JJA - long jump final".
You can fill in the distance that must be jumped/thrown to be directly placed (Q).
Then you can specify how many athletes can be placed in total (q), in this case 12. Athletics.app will first look at who are Q and then fill in the remaining 12 with q's.
NOTE: the Q's and q's work differently for running events than for technical events as described above. Read all about the running events and qualifications here: https://www.athletics.app/faq/?qa=1187/kwalificatie-instellingen-voor-loop-onderdelen

This has been automatically translated into English