Shift + option + drag (multiline-select) doesn't work on my iMac

Computer:
```
Model Name: iMac (2020 27-inch)
Processor: 6-Core Intel Core i5 3.3 GHz
Memory: 16 GB
OS Version: macOS Bug Sur Version 11.6
```

IntelliJ IDEA:

```

IntelliJ IDEA 2021.2.3 (Ultimate Edition)
Build #IU-212.5457.46, built on October 12, 2021
Runtime version: 11.0.12+7-b1504.40 x86_64
VM: OpenJDK 64-Bit Server VM by JetBrains s.r.o.
macOS 11.6
GC: G1 Young Generation, G1 Old Generation
Memory: 2048M
Cores: 12
Registry: ide.windowSystem.autoShowProcessPopup=true, ide.balloon.shadow.size=0
Non-Bundled Plugins: net.ashald.envfile (3.2.2), ru.adelf.idea.dotenv (2021.3.0.212)
Kotlin: 212-1.5.10-release-IJ5457.46

```

Shift + option + drag (multiline-select) doesn't work on my iMac. It works fine on my MacBook Pro, but not on iMac.
It(multiline-select on iMac) works fine in vscode.

It was the same no matter how many times I reset the iMac. What should I do?