What are the preferences for invoking the tooltip?
A. The preferences allows you to customize how and when to show the tooltip. When you double-click on a word, the toolitp pops up. You can disable/enable the double-click feature by removing the check mark on the checkbox.Similarly there are other choices like Ctrl+Dbl-Click for those who feel double-click annoying. Alternatively, you can press Ctrl+Shift+K (or any key of your choice) or right-click and choose “View Definition” to invoke the tooltip.