Altimeter setting and pressure altitude Student pilot here.  I thought I was smarter than this, I’m struggling with this concept.  I got the ASA test prep book and there’s a question asking what happens to the indicated altitude when the altimeter setting is changed from 29.15 to 29.85.  Answer is indicated altitude increases by 700 feet.  Ok, makes sense.
But then I’m reading the aircraft performance chapter in the Aeronautical Knowledge book.  It has a chart about finding pressure altitude, and when the altimeter setting decreases on this chart the altitude increases.  So, the converse of the concept in the question.  I can make either make sense on its own but they seem to contradict each other.  What am I missing?
Here's the difference in a nutshell:
When you change the number in Kollsman window to
bigger number and the atmosphere stays the same, the reading on your altimeter increases.
When you leave the number in the Kollsman window the same (let's say you have it set to 29.92 to see the pressure altitude) and the atmospheric conditions change so that the correct altimeter setting increases--i.e. the air pressure has increased-- then the reading on your altimeter decreases.
You increasing the setting in the Kollsman window is not the same thing as an increase in the prevailing correct altimeter setting.  They have the opposite effect on what you see on your altimeter dial.  The first thing makes the reading get higher, and the second thing makes the reading get lower.  When they both happen at the same time, the reading stays the same.
Clear as mud now?