Hello @Ruechaporn Jansuwan,
Welcome to the Atlassian Community!
I can see that in one of your sites Confluence was removed.
If you are still facing this issue, can you please let us know if you tried removing using another browser?
Maybe there is something blocking it from loading, so it’s important to test using another one or even disabling all extensions on the browser.
If it still happens, please, open the developer tools on your browser and check the console tab. It usually shows some errors that may help us to identify what is causing the issue.
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