[intellij-idea] How do I remove my IntelliJ license in 2019.3?

I think there are more solutions!

You can start the app, and here are 3 things you can do:

  1. If the app shows for the first time the "import settings" dialog and then the "create/open a project" dialog, you can click on Settings > Manage License... > Remove License, and that removes for all Jetbrains products*.
  2. If you open products like IntelliJ IDEA and have projects currently active (like the app open automatically the all IDE without prompt), then click on File > Close Project, and follow the first step.
  3. Inside any app of IntelliJ, click on Help > Register... > Remove license.

*In case you have a license for a pack of products. If not, you have to remove the license per product individually. Check the 3rd step.