Sheet views in shared file browser vs. desktop

Hi,

I have created some sheet views in a .xlsm file and shared with others in our business via OneDrive / Office 365.

Currently testing the results, and a user with read only privileges cannot use Sheet Views in the Browser version - only when he opens in desktop mode.

Am I missing a setting here? 

Does it depend on his privileges? Or his browser?

We both use Macs

Thanks, Jon