How to set single clicking to open file in IntelliJ IDEA?
Solution 1:
In the Project View click on the "gear" icon and enable Autoscroll to Source option:
Use Ctrl+Q for Quick JavaDoc and Ctrl+Shift+I for the declaration pop-up.
Solution 2:
Now it's available in a simpler way. In the Project View click on the Gear icon and then click Open Files with Single Click:
Solution 3:
Go to Preferences and turn on Enable preview tab, that will enable Open Files with Single Click for all projects.
