Things on this page are fragmentary and immature notes/thoughts of the author. Please read with your own judgement!
You can use the shortcut ctrl + shift + p to show inferred type of a variable
when the cursor is on the variable in IntelliJ IDEA.
You can also configure IntelliJ to show Scala data types
when you hover over a variable.
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File > Other Settings > Default Settings ...
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Go to "Languages & Frameworks" > Scala
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Go to the Editor tab
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Enable "Show type info on mouse hover after X ms"
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Apply/save changes.
References
https://alvinalexander.com/source-code/scala/how-configure-intellij-idea-show-scala-data-types-when-you-hover-over-field