See instructions in this Clarivate Knowledge Base article:
https://support.clarivate.com/Endnote/s/article/EndNote-Windows-CWYW-tools-are-disabled-and-missing-in-Word?language=en_US
If you still have an issue: if you have an EndNote Desktop installed on your device, you can try to Repair EndNote or Run Configure EndNote. You can follow the steps from this Knowledge Base article:
https://support.clarivate.com/Endnote/s/article/EndNote-X7X8-Windows-Install-Word-CWYW?language=en_US
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