Please check your One UI version.
[One UI 6]

1) Launcher Widget in the cover screen
- Optimized for OneUI 6.1.1 support
- App icon badge supported
2) Other bug fixes and feature improvements

Additions
- '[Tablet / Fold Device] Provide 'Maintain split mode'' (supports One UI 6.1 and above)

Fixes
- Improved visibility of navigation bar area
- Fixed phenomenon that does not reset when deleting app data

※ (Flip 5 )This version includes modifications related to 'MultiStar > I ♡ Galaxy Foldable > Launcher widget'
1) Support Dual messenger apps
2) Improved a page loading speed
3) Fixed errors that specific apps was not loading in a cover screen

- One UI 6 support
- Added Japanese language support

[One UI 5]

- (Flip 5) Limit the number of apps in the launcher widget (up to 200)
- (Flip 5) Add 'Samsung Music' to launcher widget
- (Flip 5) Fixed touch error when running app in launcher widget

- YouTube not being added to Rotate with our best.
- Fixed the phenomenon that the device died during SmartSwitch on B5 devices
- Some apps provided by Samsung as widgets are excluded from the Launcher widget list.
You can use these apps as default widgets provided.

- Added a cover widget specific to 'Flip 5'
- Added the permission for Smart Switch

<6.4.2>
- Fixed the issue of not running the app set in Cover launch widget

- Fixed errors that corner gesture
- Fixed errors that cover launcher widget

- It supports backup through smart switch.

- Fixed errors that did not execute longPress

※'One UI 5' device is available after this version.

[One UI 4]

- Fixed internal errors that MultiStar did not execute

- Bug fix to Quick launch of the Multi window

- Cover Launcher Widget function (※ Always On Display v7.1.30.4 or later)
:Support running the app directly from Galaxy Z Flip 3 cover screen
- Fix some menu descriptions

※'One UI 4' device is available after this version.
1. Support an option, 'Remove blur effect on adjusting split view'
2. Add I love Samsung DeX :
- Support high resolution regardless of the accessory
- Be able to use more apps at the same time
- “Rotate DeX with our best” in DeX on tablet screen

[One UI 3]

- Fixed the issue which it was not working after 'Pop-up view action' set ON at times.

-Added 'UDC with black' function (UDC device only)
* You can also control it through its quicksetting button.
-Fixed the touch error caused on fast split-screen by quick launch

- Fixed the wrong value return from 'All apps' in app picker list
- Fixed the linked menu of some function in Fold 3/Flip 3

- Supports ''Prevent pop-up view minimization'
- Improved the issue that 'Enable multiwindow to all apps' is not working in some apps
- Adjust the font size in MultiStar after changing resolution
- Modified a message on multiwindow restriction

- Fixed the DB update error in device supporting Long live app
- Improve performance while using 'Flex mode with our best'
- Fixed minor issue

- Support 'Flex mode with our best' (Only devices supporting Flex mode)
- Support 'Fit the app aspect ratio' in 'Rotate with our best' (Tablet only)

Enjoy your Galaxy on wider screen with MultiStar.
- Immersive Mode : Hide status bar and navigation bar in split screen view
- The app size stretch to camera hole : Open the app by widening the camera area
* Quick launch of multi-window will no longer be available from One UI 3. Thank you for using this feature.

[One UI 2(Android 10)]

Fixed the error of 'Continue to use all apps front screen'