Hi Enver Masud,
For help with the iPhone Home Screen layout, make sure you have enough available iPhone storage. The information in the article here can assist: How to check the storage on your iPhone and iPad
If you have enough storage, ensure you're arranging your folders and Home Screen with the steps here: Organize your apps in folders on iPhone - Apple Support
"Create folders
- Touch and hold the Home Screen background until the apps begin to jiggle.
- To create a folder, drag an app onto another app.
- Drag other apps into the folder.
- You can have multiple pages of apps in the folder.
- To rename the folder, touch and hold it, tap Rename, then enter a new name.
- If the apps begin to jiggle, tap the Home Screen background and try again.
- When you’re finished, tap Done, then tap the Home Screen background twice.
To delete a folder, tap the folder to open it, then drag all the apps out of it. The folder is automatically deleted.
Note: Organizing your apps on the Home Screen doesn’t affect the organization of apps in the App Library."
Should the issue occur again and a normal restart doesn't fix it, reach out to Apple Support directly to further assist.
Contact - Official Apple Support
Contact Apple for support and service - Apple Support
Best.