Select which type of asteroids your client will mine. After you change the asteroid type (and after any other time when you need to change in-game settings) you will need to repeat the first run to update the overview settings if you want to safe settings for future use.

You may use client 1 slot to mine one asteroid type, client 2 slot to mine another and switch between them manually with autostart tickbox 

Note: If you select multiple asteroids to mine you cannot refit crystals.

If you mine ice, use Ice Selector drop down menu to define ice of preference. Bonus ice is mining first, any available ice is mining at last.