how to hidden this buttons?

[805654685]

[angelborroy]

You have to override Share configuration for multi-select fields.

Following sample is adding a new option to the list:

https://github.com/Smile-SA/alfresco-basket/blob/b529551a62add152da3f20e1ad4cb52f5245014b/basket-sha...

You should override the section to pick your preferences from default list:

https://github.com/Alfresco/share-old/blob/dff4098c2f193c9708f2735c12ef9374d7614ac6/share/src/main/r...

[805654685]

oh!thank you very much

Did I add a new file under this document?

alfresco/web-extension/site-data/extensions/smile-panier-extension.xml

What should I do?

[angelborroy · Accepted solution]

Default file for share customisation is 

tomcat/shared/classes/alfresco/web-extension/share-config-custom.xml

You can learn more about it at

Share configuration files | Alfresco Documentation