There are two problems

Both of those issues appear to be related to the Windows 10 menu not Start10?

Thanks for your reply

But both problems happen when I use start10

Hello,
Sorry to hear you are having issues. But, I can't reproduce your issue on my system.

Need some information.

1) Windows version. Please use Winver.exe for full Windows version numbers.

2) Start10 version.

Thanks

Basj,
Stardock Community Assistant.

Thank you for your support

 Windows version :

start10 version : 1.94

Please try the purge and reinstall steps as mentioned here : https://forums.stardock.com/486022/start10-support-faq#reinstalling

To be sure, re-download the latest version again from your account. Reboot after the purge, reinstall using the installer you just download. Reboot again and retest.

Thank you,

Basj
Stardock Community Assistant.

I did all the steps mentioned above But Both issues still exist    

Did the issue goes away if you uninstall Start10?

Thank you,

Basj
Stardock Community Assistant.

Yes

Is the issue happened when you use Start10 panel?

Thank you,

Basj
Stardock Community Assistant.

yes 

The first issue occurs  just when windows 10 style and windows 10 button are used ...  The background of the Start menu button in the first photo is not transparent 

But in the default icon, the background is transparent

Ah, I see it, that is because, I believe, the Original Windows 10 start button is not transparent.

You can always change that with others. You could find a few from here : https://www.wincustomize.com/explore/start10_buttons/search/windows+10

Thank you,

Basj
Stardock Community Assistant.

OK

But I think it creates disorder in the taskbar. Hopefully, this issue will be resolved in the next update.

However, this was the first issue 

And the solution to the second issue ?

Well, I can't recreate the second issue on my system, so I can't be sure what is the problem there. Maybe you can try this : https://forums.stardock.com/486022/start10-support-faq#cleanboot

Thank you,

Basj
Stardock Community Assistant.

BTW, on the First issue, I uninstalled Start10 from one of my box and I found out that with Default Windows 10 Start panel button down it is by default is not transparent. So I think there is no issue here. If you need a transparent Windows 10 start button, you will need to use the custom made one.

Thank you,

Basj
Stardock Community Assistant.

Thank you for all your answers and efforts

I thought that if the start button was transparent, the first issue would be solved.