Dear respected Mohamed Taarji,
Good day! Thank you for posting to Microsoft Community. We are happy to help you.
As per your description, firstly may I know are you shared your Excel file from OneDrive for business/SharePoint online document library? does the user appear under the “Direct Access”? if yes, then you may stop via Remove direct access.
In a sharing UI, we can only stop sharing/ remove specific user under a “Direct Access” (if we share file via +Grant access).
We feel your pain due to this limitation and we’re really feel sorry for it. However, we appreciate your understanding. I do understand the inconvenience and apologize for it.
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Since you mentioned, "We only see options for "read" and "edit" access" I suspect you shared Excel file via a share button and not give +Grant access, that why you did not see remove option. In this scenario, I'm afraid you may stop sharing for all existing shared users and then share file again via "+Grant access" button.
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Appreciate your patience and understanding and thank you for your time and cooperation.
Sincerely,
Waqas Muhammad