IntelliJ Idea 2018.2 - File Status Highlights: red/brown - intellij-idea

Question

I have the current status of my files in the folders coloured red/brown.
I tried to follow previous discussion on stackoverflow to solve the problem but without result.
How can get rid of the red colour of the file?
What is the correct settings?
with pom.xml
> <?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<groupId>delta.project</groupId>
<artifactId>books</artifactId>
<version>1.0-SNAPSHOT</version>
<modelVersion>4.0.0</modelVersion>
<properties>
<maven.compiler.source>10</maven.compiler.source>
<maven.compiler.target>10</maven.compiler.target>
</properties>
<dependencies>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.12</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.mockito</groupId>
<artifactId>mockito-all</artifactId>
<version>1.9.5</version>
<scope>test</scope>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-jar-plugin</artifactId>
<version>2.4</version>
<configuration>
<archive>
<manifest>
<mainClass>app.Run</mainClass>
</manifest>
</archive>
</configuration>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<configuration>
<source>10</source>
<target>10</target>
</configuration>
</plugin>
</plugins>
</build>
</project>
and iml file:
<?xml version="1.0" encoding="UTF-8"?>
<module org.jetbrains.idea.maven.project.MavenProjectsManager.isMavenModule="true" type="JAVA_MODULE" version="4">
<component name="NewModuleRootManager" LANGUAGE_LEVEL="JDK_10">
<output url="file://$MODULE_DIR$/target/classes" />
<output-test url="file://$MODULE_DIR$/target/test-classes" />
<content url="file://$MODULE_DIR$">
<sourceFolder url="file://$MODULE_DIR$/src/main/java" isTestSource="false" />
<sourceFolder url="file://$MODULE_DIR$/src/test/java" isTestSource="true" />
<sourceFolder url="file://$MODULE_DIR$/src/test/resources" type="java-test-resource" />
<sourceFolder url="file://$MODULE_DIR$/src/main/resources" type="java-resource" />
<excludeFolder url="file://$MODULE_DIR$/target" />
</content>
<orderEntry type="inheritedJdk" />
<orderEntry type="sourceFolder" forTests="false" />
<orderEntry type="library" scope="TEST" name="Maven: junit:junit:4.12" level="project" />
<orderEntry type="library" scope="TEST" name="Maven: org.hamcrest:hamcrest-core:1.3" level="project" />
<orderEntry type="library" scope="TEST" name="Maven: org.mockito:mockito-all:1.9.5" level="project" />
</component>
</module>
Screenshot of my configuration of the project:
modules:
dependencies:

Answer 1

This is a version control feature that marks files that hasn't been staged yet this color.
To remove this behaviour go to
Settings -> Version Control -> File Status Colors
where you can set colors for all statuses or disable them by removing the checkmark from the "File status color" field.

Answer 2

This is because the files are not added into your version control, e.g. Git. Try to select the files, right click, and add them to version control. After that, they should turn into green.