Question 

Some actions not working or working with delay. For example context menu does not appear. 

How to configure Debug logs to capture these events? 

Answer

1. Open Help | Diagnostic Tools | Debug Log Settings...

2. Add the  following line: 

#com.intellij.openapi.actionSystem.impl.ActionUpdater

3. Click OK

4. Reproduce the problem.

5. Log files can be found at:

• From inside IntelliJ IDEA:
  • Help | Show Log in Explorer/Files/Navigator/Finder
  • Help | Collect Logs and Diagnostic Data
    

• Manually (~ stands for the user home directory and XX for the number of the version):
  • Windows: %USERPROFILE%\AppData\Local\JetBrains\IntelliJIDEAXXXX.Y\log
  • Linux: ~/.cache/JetBrains/PhpStormXXXX.Y/log
  • macOS: ~/Library/Logs/JetBrains/PhpStormXXXX.Y

More information about the directories used by IDEs can be found here. 

The latest log file is named idea.log, older files names end with a number, i.e. idea.log.1, idea.log.2, etc. In most cases, you need only the latest one.