Can’t see a build log with warnings when the build succeeded

I’ve started using PlatformIO IDE. I’m coding for Arduino.
I can’t see a detailed build log, with the compiler warnings when the build succeeded. I can
see the Issues panel, when pressing x issues in the status bar, but it’s confusing, because I’m not sure if the issue is a compiler error or a lint message. Also, I didn’t find a build log file.
How can I see the compiler log and how can I get it to log in file?

See Frequently Asked Questions. You need “Keep build panel visible”, or Menu: PlatformIO > Toggle Build Panel (F8).