Check the permission of the particular users where the "Share Customized" option is enabled or not
check the below image for reference
Share Customized should be enabled in order to save the view
Check this link to know how to edit/ view the permissions: View or Edit Permissions
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Thanks you for your answer.
I understand what permissions i need to give but i think a "viewer" license can't get this permission. The weird thing is that is some dashboards users can save the view and in other they can't.
Any idea why is that?
Any update on this? Can someone confirm that Viewers should have the customized view option? Does this option depend on site role or only on the project/workbooks permissions?