I accidentally disabled Multi-Window in Apps menu on my Huawei P30 and it disappeared

Hello!

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Regards.

Hi, friend.

1.  Please check the Multi-Window function is enabled at first.
You can click Setting -> Accessibility -> Multi-Window. if no, please enable it.
2. Open an app and swipe up on your phone once to enable the app to run in the background,

3. Open another app again (unlike the previous one) and swipe up twice to display all apps in the background,

4. Tap the split screen button on the app to display the app on split screens.