You can use the following steps to remove the X8 tools and add the X7 tools back.
Close Word.
Click the EndNote menu and select “Customizer.”
Uncheck the box in front of the “Cite While You Write” option.
Click next until the Customizer is finished.
then go back
Click the EndNote menu and select “Customizer.”
Check the box in front of the “Cite While You Write” option.
Click next until the Customizer is finished.
Open Word anc check for the EndNote X7 tab.
Let us know if you have any questions or if this does not resolve the issue.