No repositories listed when using Kotlin DSL Gradle project

I've created a new Gradle project (Kotlin DSL) that uses the mavenCentral() repository. However, the repository is not shown in the Maven repository list (Settings -> Build, Execution, Deployment -> Build Tools -> Maven -> Repositories) and therefore cannot be updated, so I don't have any autocomplete for groups, artifacts and versions when I add new dependencies.

How can I index the repository to get autocompletion.

I'm using IntelliJ Ultimate, version 2028.3.3.

Here is my build.gradle.kts:

import org.jetbrains.kotlin.gradle.tasks.KotlinCompile

group = "de.matthjes"
version = "0.0.1-SNAPSHOT"

repositories {
mavenCentral()
}

dependencies {
compile(kotlin("stdlib-jdk8"))
implementation("org.jetbrains.kotlinx:kotlinx-coroutines-core:1.1.0")
implementation(group = "ch.qos.logback", name = "logback-classic", version = "1.2.4")
}

plugins {
kotlin("jvm") version "1.3.11"
}

tasks.withType<KotlinCompile> {
kotlinOptions.jvmTarget = "1.8"
}