Back to modem Quartus from Xilinx side.
I found my compiled status doesn't seem to be up-to-date inside Quartus Tasks Pane (no green tick, 16.1, 18.1) every time I try to open a report, Quartus starts over the "Compile Design".
I guess compiled results are on disk. But it's inconvenient to locate for new user.
I was expecting all results from previous successful compile are kept for review.
Thanks for reply, I recreated a new project and found no such issue. I am sure it's something run with my current project configurations, but it's not that important. I will close this question