Eclipse mark occurrences Scala doesn't work at all

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As it is mentioned in the title, mark occurrences in eclipse for Scala is not working.

It works fine with java code.

I have to mention that "Toggle Mark Occurrences" is activated as follow enter image description here

I have to mention as well, that in Preferences > General > Editors > Text Editors > Annotations both Occurrences & Write Occurrences have the Text as Highlighted option selected and with I even changed the color. always nothing happens

enter image description here

Also, I have another question, I have to enable the option that let me access the origin of a variable or a class, I don't know how we call it, but what I mean is, when I press on ctrl and click on an variable or a method it takes me to where it was declared. It works fine on java classes, but I want to enable it for Scala.

I use:

  • Eclipse 2020-03
  • plugin Scala IDE 4.7.x
  • Scala version 2.9.0.1

enter image description here

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RokoHroko On

In Scala IDE, click on this button in the toolbox to activate Mark Occurrences (off by default) :

link to the screenshot